An element has an atomic mass number of 16 in atomic number of 7.the element has (7 8 9) protons and (7 8 9) neutrons. fill in the blank.

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

Can a trait be both polygenic and have multiple alleles? explain why or why not.

Which of the following types of pollution is most responsible for large numbers of deaths worldwide because of unsafe drinking water? (a) nutrient pollution (b) thermal pollution (c) pathogen pollution (d) sediment pollution