Which of the following best describes how galaxies exist in the universe

a.) they exist together with no empty space between them

b.) they are evenly distributed throughout the universe

c.)they form clusters that are light years away from other clusters

d.) they spin within a few miles from eachother

Hemoglobin is a proton that carries oxygen around the body what is hemoglobin made from

Answers to mastering biology drag the labels to their appropriate locations to complete the punnett squares for morgan's reciprocal cross. drag blue labels onto the blue targets to indicate the genotypes of the parents and offspring. drag pink labels onto the pink targets to indicate the genetic makeup of the gametes (sperm and egg). labels can be used once, more than once, or not at all. hints

What are 3 reasons that natural selection occurs