8) The migratory eel, Anguilla rostrata, is born and lives the juvenile (immatur

Question

8) The migratory eel, Anguilla rostrata, is born and lives the juvenile (immature) part of its life in a freshwater environment, but then migrates thousands of miles through in order to breed. These eels are known to regulate their internal water and salt balance. What adaptations would you expect this eel to have in order to transition from fresh water to salt water at these two life stages? A) The juvenile eels would be better at removing salt from their bodies compared to aduits. B) The adult eels would be better at removing salt from their bodies compared to juveniles C) The juvenile eels would spend energy keeping water in their bodies. D) The adult eels would spend energy keeping salt in their bodies the ocean as an adult 9) The metamorphosis of a tadpole to an adult frog involves a thorough reconstruction of the animal's body. All of the structural and physiological changes must be complete or the frog will not survive this transformation. Which type of regulation would ensure that the animal completed its transformation? A) positive feedback B) negative feedback C) feedback inhibition

Explanation / Answer

1.c

Juvenile cells when goes to marine environment to compensate water loss they spend energy keeping water in their body

2.B

The main harmone which is responsible for metamorphosis is thyroxin

This pathway is regulated by negative feedback loop between the thyroid gland and anterior pituitary regulated the levels of T4

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