In which of these ways might an ectotherm respond to changes in environmental temperature? A. fight or flight
B. move elsewhere
C. shiver
D. sweat or pant

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.

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

Sea stars, sea urchins, sand dollars, and brittle stars are all memeber of a group, what is the common name of the group they are all in