Which is kept open at all times by rings of boney material called dash

Compare the composition of the moon's surface with the composition of the earth's surface.

What maintain homeostasis when a persons internal body temperature is 97.5°f

Gregor mendel is best known for his work with pea plants and for uncover many of the mysteries of genetics. one of his major findings stated that there were specific, physical units of inheritance that are transmitted during reproduction. what is the the name given to these units of inheritance which can be found on chromosomes? a) centromeres b) cytoplasm c) genes d) nucleotides