Are the smallest, thinnest vessels in a closed circulatory system and are the site of the exchange of oxygen and carbon dioxide

a: arteries
b: capillaries
c: veins

What are some aquatic organisms that live in cold water temperatures?

Select all the true statements about the cosmic microwave background radiation

If the rna molecule in a human has the nucleotide sequence of guu, this would the amino acid valine would be needed to make the protein. how would this cha process was occurring in a mushroom?