Male scorpions usually have longer bristles on their pectines why is this?

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.

If jane has the blood type ab and marries john who has type o blood what are the possible phenotypes of their first kid?

Which worm has eyespots that are used to detect light? a fluke b marine worm c planarian d tapeworm