The is thin and smooth and is the innermost layer of the heart.

This is due ! matching pairs of chromosomes from parents are called a. homologous chromosomes b. heterozygous chromosomes c. herterogenes d. homologous bands

Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 1.b,2.c,3.a,4.d

Modern sea star larvae resemble some primitive vertebrate larvae. this similarity may suggest that primitive vertebrates