Problem Overview:
The task involves categorizing cetaceans (marine mammals) into two groups:
Toothed and
Baleen, based on the images provided. Additionally, there is a request to briefly discuss marine mammals and the division of cetaceans into these two groups.
Solution:
#### Step 1: Understanding Cetaceans
Cetaceans are marine mammals that are completely aquatic. They are divided into two main groups:
1.
Toothed Cetaceans: These have teeth and use them for catching prey.
2.
Baleen Cetaceans: These have baleen plates instead of teeth, which they use to filter food from water.
#### Step 2: Analyzing the Images
We need to identify which images correspond to toothed cetaceans and which correspond to baleen cetaceans. Here are the images and their corresponding labels:
-
Image D: Shows dolphins swimming together.
-
Image B: Shows a large whale.
-
Image O: Shows orcas (killer whales).
-
Image S: Shows a sperm whale.
-
Image B: Shows a pink dolphin.
-
Image N: Shows a narwhal.
#### Step 3: Categorizing the Images
-
Toothed Cetaceans:
-
Dolphins (Image D): Dolphins have teeth and are toothed cetaceans.
-
Orcas (Killer Whales) (Image O): Orcas are also toothed cetaceans.
-
Sperm Whale (Image S): Sperm whales have teeth and are toothed cetaceans.
-
Pink Dolphin (Image B): Pink dolphins have teeth and are toothed cetaceans.
-
Narwhal (Image N): Narwhals have a single tusk (tooth) and are toothed cetaceans.
-
Baleen Cetaceans:
-
Large Whale (Image B): This appears to be a humpback whale or a similar species, which has baleen plates and is a baleen cetacean.
#### Step 4: Filling in the Worksheet
Based on the analysis:
-
TOOTHED:
- D (Dolphins)
- O (Orcas)
- S (Sperm Whale)
- B (Pink Dolphin)
- N (Narwhal)
-
BALEEN:
- B (Large Whale)
#### Step 5: Briefly Discussing Marine Mammals and Cetaceans
-
Marine Mammals: These are mammals that live in aquatic environments. They include cetaceans (whales, dolphins, porpoises), pinnipeds (seals, sea lions, walruses), sirenians (manatees, dugongs), and polar bears.
-
Division of Cetaceans:
-
Toothed Cetaceans: Use teeth to catch and eat prey such as fish, squid, and other marine animals. Examples include dolphins, orcas, sperm whales, and narwhals.
-
Baleen Cetaceans: Use baleen plates to filter small organisms like krill, plankton, and small fish from large volumes of water. Examples include blue whales, humpback whales, and right whales.
Final Answer:
-
TOOTHED: D, O, S, B, N
-
BALEEN: B
$$
\boxed{\text{TOOTHED: D, O, S, B, N; BALEEN: B}}
$$
Parent Tip: Review the logic above to help your child master the concept of marine science worksheet.
