Unlike food webs, food chains
a. involve a network of complex interactions among various organisms in an ecosystem.
b. contain consumers that eat producers.
c. contain autotrophs that make their own food.
d. involve a single chain of energy transfer from one organism to another through consumption.

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

Up until 1938, paleontologists accepted the idea that coelacanths (an ancient fish) went extinct at the time that they last appear in the fossil record, about 80 million years ago. but in 1938, a live coelacanth was discovered off the coast of south africa that was compared to the fossil record and found to be the same species what goal of science does this discovery represent

Anurse is caring for a 42-year-old client who is scheduled for an amniocentesis during the fifteenth week of gestation because of concerns regarding down syndrome. what other fetal problem does an examination of the amniotic fluid reveal at this time?