Why is it necessary for animals to have a circulatory system?
o to move blood
o to breathe
o to maintain homeostasis
o to exchange materials with its environment

Study the image of this rock.which characteristic best supports its formation from sedimentary processes? it has many layers.it is coarse-grained.its grain shape is round.its texture is non-banded.

In an hydrogen ion pump the energy is used to join small molecules together to make larger ones which factor most likely has the greatest effect on the number of molecules mitochondria can produce

True or false: the breakup of pangea resulted in warm wet global climates?