Which term best indicates the structures represented by the circle labeled x?
(1) organelles (3) organ systems
(2) chromosomes (4) tissues

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.

Which codon is the code for the amino acid histidine (his)?

Identify the missing parts of the carbon cycle