What gives plant cell walls their rigidity? chloroplasts cellulose molecules central vacuoles plasmodesmata

The diagram shows a fossil of an ancient whale skull and a skull of a present-day whale. the ancient whale is extinct and is believed to be an ancestor of the present-day whale. what do these skulls most likely show that supports darwin’s theory of evolution? all populations can adapt and survive. only some organisms have a common ancestor. populations change slowly over time. populations rapidly become extinct.

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels

Me with biology endocrine system crossword also image left i need with hw