In what ways do organelles make a cell more efficient

What was the land like over 500 million years ago? what was under the sea?

Which statement about the pancreas is not true? a. it is an endocrine organ in the abdomen. b. it release chemicals into the digestive system. c. it releases insulin to increase glucose levels. d. it release hormones into the bloodstream.

In the ocean why are the greatest amount of primary producers found in the epipelagic zone and how does that affect biodiversity