Name the organelle who is known as the "powerhouse" of the cell.
Select one:
a. cytoplasm
b. Mitochondria
c. chloroplast
d. cell membrane

Which type of organism is missing from the food web seen in the illustration? primary consumers decomposers primary producers secondary consumers

Which of these has happened to your food by the time it reaches your small intestine? a. all the macromolecules have been broken down completely. b. lipids and starches have been partially broken down. c. starches and proteins have been partially broken down. d. proteins and lipids have been broken down into subunits.

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.