Green algae is considered an ancestor of modern plants because

a)they have chlorophyll contained in chloroplasts
b)they are the largest of all of the algae
c)they also have brown and red pigments
d)they are producers

Many body systems work together for proper functioning of the body and to maintain internal homeostasis. the works to break down food eaten before exercising. the takes in the nutrients obtained from the food. the body sweats as a mechanism to cool off, because the is working to flush out toxins.