Which of the following describes arteries?
a. they have thick muscular walls.
b. they usually contain valves.
c. they carry blood towards the heart.
d. they carry blood from the lungs.

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

16. which of the following accurately describes a step within transcription? a. dna polymerase uses one strand of rna as a template to put together nucleotides. b. the dna strand is used as a template for which a complementary rna strand can be produced. c. the rna strand forms a template by which dna can be built. d. the rna strand is produced within the cytoplasm.

Will give ! ! widentify the advantages and disadvantages of renewable and nonrenewable energy resources.