Earthworm anatomy diagram with organ systems color-coded: Circulatory (red), Reproductive (blue), Digestive (green), Nervous (yellow), and Skin (brown/beige).

Since I can't view or analyze images directly, I’ll help you solve the task based on your description and standard biological knowledge of earthworm anatomy.

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Step 1: Labeling the Organs in the Earthworm Diagram

Here are the key organs to label and their locations in an earthworm:

1. Pharynx – Located near the anterior (front) end, just behind the mouth. It's involved in swallowing food.
2. Esophagus – A tube that connects the pharynx to the crop; it runs posteriorly from the pharynx.
3. Crop – A storage organ for food, located just after the esophagus. It appears as a slightly enlarged region.
4. Gizzard – Lies just behind the crop; it grinds food with muscular contractions and sand particles.
5. Aortic arches – These are blood vessels connecting the dorsal and ventral blood vessels; they form a "heart-like" structure and are usually found near the anterior region (around segments 7–11).
6. Dorsal blood vessel – Runs along the top (dorsal side) of the body; carries blood toward the head.
7. Brain – A small nerve ganglion located in the first few segments (segment 3), above the pharynx.

> 🔍 Tip: The brain is part of the nervous system and is typically found just behind the pharynx.

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Step 2: Color-Coding the Organ Systems

Use the color key provided:

- Circulatory System – Red: Includes the dorsal blood vessel, aortic arches.
- Reproductive System – Blue: Includes seminal vesicles, ovaries, oviducts, sperm ducts (vas deferens), clitellum (not shown in internal diagram).
- Digestive System – Green: Pharynx, esophagus, crop, gizzard, intestine.
- Nervous System – Yellow: Brain (cerebral ganglia), ventral nerve cord.
- Skin (outer) – Brown or beige: This refers to the outer body wall (epidermis).

> ✔ So:
> - Dorsal blood vessel & aortic arches → Red
> - Pharynx, esophagus, crop, gizzard → Green
> - Brain → Yellow
> - Reproductive organs (if visible) → Blue
> - Outer skin → Brown/beige

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Answer 1: What does it mean that earthworms are hermaphroditic?

Answer:
Earthworms are hermaphroditic, which means each individual possesses both male and female reproductive organs. That is, every earthworm has testes (to produce sperm) and ovaries (to produce eggs). However, they still need to mate with another earthworm to exchange sperm, as self-fertilization does not occur.

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Answer 2: Describe reproduction in earthworms. Be sure to include the organs involved.

Answer:
Earthworm reproduction involves a mating process between two individuals. Here’s how it works:

1. Mating: Two earthworms align themselves head-to-tail and secrete a mucous lining around their bodies. They exchange sperm through sperm ducts (vas deferens), which open near the clitellum (a thickened glandular section near the front of the body).

2. Fertilization: After mating, each worm forms a cocoon using its clitellum. The cocoon slides forward over the worm’s body, collecting eggs from the ovaries and sperm from the other worm’s sperm receptacles (seminal receptacles).

3. Development: The cocoon is then deposited in moist soil. Inside, the eggs are fertilized by the stored sperm and develop into young earthworms.

Organs involved:
- Testes – Produce sperm
- Ovaries – Produce eggs
- Vas deferens – Carry sperm out
- Seminal receptacles – Store sperm received from partner
- Clitellum – Produces the cocoon
- Oviducts – Carry eggs from ovaries to the outside

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Summary of Labels & Colors

| Organ / Structure | Color | System |
|-------------------------|------------|----------------------|
| Pharynx | Green | Digestive |
| Esophagus | Green | Digestive |
| Crop | Green | Digestive |
| Gizzard | Green | Digestive |
| Aortic arches | Red | Circulatory |
| Dorsal blood vessel | Red | Circulatory |
| Brain | Yellow | Nervous |
| Skin (outer body wall) | Brown/Beige| Skin (integumentary) |

Let me know if you'd like a labeled diagram explanation or further clarification!