Which part collects urine until it is expelled from the body?

What are some things that limit population growth?

Anormal appearing couple is found to be heterozygous recessive for albinism both have the genotype aa the gene responsible for albinism is recessive to the normal pigment-producing gene what are the changes of their children being albino

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