The cell membrane of a tube worm keep excess salt out of its body cells in order to

a) send message
b) repel preadators
c) maintain homeostasis
d) receive messages

The earth's polarity has switched many times through history as evidence by what wh the earth clorets he has switched many times throughout history as evidence by what

The cluster of developing cells from conception until birth is called an

Select the correct answer from each drop-down menu proteins are