Many cells have a nucleus that contains chromosomes. these chromosomes carry genes that are composed of

a
hormones

b
minerals and water

c
dna molecules

d
undigested food molecules

Describe the primary and secondary immune response in terms of speed and number of antibodies produced?

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.

What is a gene ? a) a section of a protein that codes for dna. b) the alternate version of a trait. c) the visible trait in the f1 generation. d) a section of dna that codes for a specific trait .