Use the dichotomous key to identify the six insects labeled A through F based on their physical characteristics.

Let’s work through this step by step.

We have a dichotomous key — that’s like a decision tree to identify insects based on their features. We’re given 6 insect drawings labeled A through F, and we need to match each one to its correct scientific name using the key.

First, let’s understand the key:

Step 1:
- If the insect has 2 wings → go to step 2
- If it has more than 2 wings → go to step 3

Step 2 (for 2-winged insects):
- Long skinny abdomen → Tupula simplex
- Short broad abdomen → Apis mellifera

Step 3 (for >2-winged insects):
- Broad wings → go to step 4
- Thin wings → go to step 5

Step 4 (broad wings):
- Spots on wings → Chaetocneme denitza
- No spots → Catopsila pomona

Step 5 (thin wings):
- Broad abdomen → Bombus fervidus
- Thin abdomen → Hexagenia limbata

Now, let’s look at each insect drawing and apply the key.

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Insect A:
- Looks like it has 2 wings (only two visible wings, typical of flies or bees? Wait — actually, looking closely, it has 4 wings? No — wait, in insects, some have 2 pairs (so 4 total), but the key says “2 wings” vs “more than 2”. So if it has 4 wings, that’s more than 2 → go to step 3.

Wait — let’s be careful. In entomology, “2 wings” usually means one pair (like flies). “More than 2” means two pairs (like butterflies, bees, etc.).

Looking at the drawings:

A: Has 2 wings? Actually, no — it has 4 wings (two on each side). But wait — maybe the drawing is simplified. Let’s compare all.

Actually, let’s list what we see:

A: Two wings? Or four? It looks like two large wings — but in reality, many insects have two pairs. However, for this key, we must go by what’s drawn.

Looking again:

Insect A: Appears to have 2 wings (one on each side) — so likely “2 wings” → go to step 2.

Abdomen: Short and broad → matches “Apis mellifera”

So A = Apis mellifera

But wait — let’s check others to confirm.

Insect B: Very long legs, long body, wings look thin and maybe only 2? Actually, it looks like a crane fly — which has 2 wings. Abdomen is long and skinny → so step 2a → Tupula simplex

So B = Tupula simplex

Insect C: Looks like a bee — 4 wings (broad), abdomen short and broad → so step 3 (more than 2 wings) → broad wings → step 4 → no spots? Wings look plain → Catopsila pomona? But wait — Catopsila pomona is a butterfly? Let’s see.

Actually, let’s go systematically.

Better approach: For each insect, count wings first.

Assume:
- “2 wings” = one pair (total 2)
- “More than 2” = two pairs (total 4)

Look at drawings:

A: Two wings (one on each side) → 2 wings → step 2 → abdomen short/broad → Apis mellifera

B: Two wings, very long abdomen → step 2 → long skinny abdomen → Tupula simplex

C: Four wings (two on each side), broad wings, no spots → step 3 → broad wings → step 4 → no spots → Catopsila pomona

D: Four wings, broad, has spots → step 3 → broad wings → step 4 → spots → Chaetocneme denitza

E: Four wings, broad, no spots? Wait — E looks like a moth, wings broad, no obvious spots → Catopsila pomona? But C is also Catopsila? That can’t be.

Wait — let’s re-examine.

Actually, looking at the images:

A: Fly-like, 2 wings, short abdomen → Apis mellifera? But Apis mellifera is honeybee — which has 4 wings. Contradiction.

I think I made a mistake.

Let me reconsider: In standard dichotomous keys for insects, “2 wings” typically refers to Diptera (flies), which have one pair of functional wings (the hind wings are reduced to halteres). “More than 2 wings” means insects with two pairs (like beetles, butterflies, bees, etc.).

So:

Insect A: Looks like a fly — 2 wings → step 2 → abdomen short/broad → Apis mellifera? But Apis mellifera is a bee, not a fly. This is confusing.

Perhaps the key is mislabeled, or the drawings are stylized.

Let’s look at the word bank and match logically.

Word Bank:
- Tupula simplex — likely a crane fly (long legs, long body)
- Apis mellifera — honeybee
- Chaetocneme denitza — a butterfly with spots
- Catopsila pomona — a butterfly without spots
- Bombus fervidus — bumblebee
- Hexagenia limbata — mayfly, thin abdomen

Now, match to drawings:

A: Bee-like, but if it has 2 wings, it might be misdrawn. Perhaps it's meant to be a fly? But name is Apis mellifera — which is bee.

This is tricky.

Alternative approach: Use the key as written, regardless of real biology.

For each insect, follow the key literally.

Start with A:

A: How many wings? Drawing shows two wings (left and right). So "2 wings" → go to 2.

Step 2a: long skinny abdomen? No, abdomen is short and broad → so 2b → Apis mellifera

So A = Apis mellifera

B: Wings: two wings, long skinny abdomen → 2a → Tupula simplex

C: Wings: four wings (clearly two on each side) → more than 2 → go to 3

Step 3a: broad wings? Yes → go to 4

Step 4a: spots on wings? Looking at C — no spots, plain wings → 4b → Catopsila pomona

D: Four wings, broad, has spots → 3a → 4a → Chaetocneme denitza

E: Four wings, broad, no spots? But E looks like a moth, wings broad, no spots → same as C? But C is already Catopsila.

Wait, E might have spots? Let's assume from drawing: E has no spots, broad wings → Catopsila pomona — but that would duplicate.

Perhaps E is different.

Look at E: Wings are broad, but maybe they consider it thin? No, compared to F, E has broader wings.

F: Wings look thin, abdomen thin → step 3b (thin wings) → go to 5 → 5b → Hexagenia limbata

Now E: Four wings, broad, no spots → should be Catopsila pomona, but C is also that.

Unless C has spots? Let's check the drawing description.

In the image, D has spots, C does not, E does not — but perhaps E is Bombus fervidus? But Bombus has broad abdomen, and step 5 is for thin wings.

I think there's a mistake in my wing count.

Let's list each insect with features:

A:
- Wings: 2 (appears so)
- Abdomen: short, broad
→ Step 2b: Apis mellifera

B:
- Wings: 2
- Abdomen: long, skinny
→ Step 2a: Tupula simplex

C:
- Wings: 4 (broad)
- Spots: no
→ Step 3a → 4b: Catopsila pomona

D:
- Wings: 4 (broad)
- Spots: yes
→ Step 3a → 4a: Chaetocneme denitza

E:
- Wings: 4 (broad)
- Spots: no? But if no spots, same as C. Perhaps E has spots? Or maybe it's Bombus.

Wait, Bombus fervidus is a bumblebee, which has 4 wings, broad abdomen, and no spots on wings typically.

But in the key, Bombus fervidus is under step 5, which is for thin wings.

Step 5: thin wings → broad abdomen → Bombus fervidus

So for Bombus, it must have thin wings? But bees have broad wings.

This is inconsistent.

Perhaps for E: wings are broad, but abdomen is broad, and if we go to step 4, no spots, so Catopsila, but that's already C.

Unless C is not Catopsila.

Let's look at the drawings again mentally.

Perhaps A is not 2 wings. In many such keys, bees are considered to have 4 wings, so "more than 2".

Let me try that.

Assume that all insects except flies have 4 wings, so "more than 2".

Insect A: If it's a bee, it has 4 wings → step 3 → broad wings → step 4 → no spots → Catopsila pomona? But A looks like a bee, and Catopsila is a butterfly.

This is messy.

Perhaps the key is designed such that:

- A: bee, 4 wings, broad, no spots → Catopsila pomona? But that doesn't make sense.

Another idea: perhaps "2 wings" means the insect has only two wings visible or functional, but in drawing, A has two wings, so it's a fly.

But the name Apis mellifera is given, which is bee.

I think there might be a error in my initial assumption.

Let's use the key strictly as written, and match the names.

From the key, the outcomes are:

- Tupula simplex: 2 wings, long skinny abdomen
- Apis mellifera: 2 wings, short broad abdomen
- Chaetocneme denitza: >2 wings, broad wings, spots
- Catopsila pomona: >2 wings, broad wings, no spots
- Bombus fervidus: >2 wings, thin wings, broad abdomen
- Hexagenia limbata: >2 wings, thin wings, thin abdomen

Now, match to drawings:

A: 2 wings, short broad abdomen → Apis mellifera

B: 2 wings, long skinny abdomen → Tupula simplex

C: >2 wings (4), broad wings, no spots → Catopsila pomona

D: >2 wings, broad wings, spots → Chaetocneme denitza

E: >2 wings, broad wings, no spots — but that's same as C. Unless E has thin wings? Looking at E, wings are broad, but perhaps in comparison, it's considered thin? No.

F: >2 wings, thin wings, thin abdomen → Hexagenia limbata

Then what is E? E must be Bombus fervidus, but Bombus has broad abdomen, and if wings are thin, then step 5a.

So for E: if wings are thin, abdomen broad → Bombus fervidus

In the drawing, E's wings might be considered thin compared to C and D.

C and D have very broad wings (butterflies), E has wings that are broad but perhaps less so, or maybe it's a moth with thinner wings.

In many keys, moths have broader wings than mayflies, but here F is mayfly with thin wings.

Perhaps E is Bombus, with thin wings and broad abdomen.

So let's assign:

E: >2 wings, thin wings (compared to butterflies), broad abdomen → Bombus fervidus

F: >2 wings, thin wings, thin abdomen → Hexagenia limbata

And C: >2 wings, broad wings, no spots → Catopsila pomona

D: >2 wings, broad wings, spots → Chaetocneme denitza

A: 2 wings, short broad abdomen → Apis mellifera

B: 2 wings, long skinny abdomen → Tupula simplex

That covers all.

So:

A. Apis mellifera

B. Tupula simplex

C. Catopsila pomona

D. Chaetocneme denitza

E. Bombus fervidus

F. Hexagenia limbata

Now, verify with word bank:

Word Bank has:
Tupula simplex
Apis mellifera
Chaetocneme denitza
Catopsila Pomona (note: capitalized P, but same)
Bombus fervidus
Hexagenia limbate (spelled limbate, but should be limbata? Probably typo, but we'll use as given)

In the key, it's "Hexagenia limbata", in word bank "limbate" — likely typo, but we'll use the key's spelling for answer.

In the final answer, we should use the names as per key.

So for F, it's Hexagenia limbata, but word bank says limbate — probably a mistake, but we'll go with key.

In the user's image, word bank has "Hexagenia limbate", but key has "limbata" — I think it's a typo, and we should use the key's version for identification.

But in the answer, we'll write as per key.

Now, for the blanks:

A. Apis mellifera

B. Tupula simplex

C. Catopsila pomona

D. Chaetocneme denitza

E. Bombus fervidus

F. Hexagenia limbata

But in word bank, it's "Catopsila Pomona" with capital P, but in key it's "pomona" lowercase — we'll use as in key.

Similarly, "Hexagenia limbate" in word bank, but key says "limbata" — I think for accuracy, we use the key's spelling.

In the final answer, we'll write the names as they appear in the key's outcome.

So:

A. Apis mellifera

B. Tupula simplex

C. Catopsila pomona

D. Chaetocneme denitza

E. Bombus fervidus

F. Hexagenia limbata

Now, to confirm, let's see if E makes sense as Bombus fervidus.

Bombus fervidus is a bumblebee, which has 4 wings, but in the key, it's under thin wings — which might be a simplification or error, but based on the key, if we interpret E's wings as thin (compared to butterflies), and abdomen broad, then yes.

Similarly, F is Hexagenia limbata, a mayfly, with thin wings and thin abdomen.

So this should be correct.

Final Answer:

A. Apis mellifera
B. Tupula simplex
C. Catopsila pomona
D. Chaetocneme denitza
E. Bombus fervidus
F. Hexagenia limbata