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The swim bladder is located in the body cavity and is derived from an outpocketing of the digestive tube. It contains gas (usually oxygen) and functions as a hydrostatic, or ballast, organ, enabling the fish to maintain its depth without floating upward or sinking.
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Answer:
Migration is when animals move on a regular cycle. For example, caribou in the Arctic go south in winter and return in summer when it's warmer. Many birds migrate, such as geese and storks. Migration is the travelling of long distances in search of new habitat.
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Answer: you didn't state the answers to choose from so i"ll just list common organic molicules: nucleic acids, proteins, carbohydrates and lipids.
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Answer:
cell walls and chloroplasts
If the gravity of the earth increases, our weight increases cause everything to be heavier