In order to explain how the first eukaryotic cells may have evolved, scientists proposed the

A. theory of solar nebula.

B. theory of spontaneous generation.

C. theory of endosymbiosis.

D. theory of autotropic evolution.

Explain why arginine is classified as essential even though we make it in the urea cycle.

How is Earth's motion related to the origin of the galaxy and its solar system?

What structure faces up that lies at the bottom of the mantle above the tentacles in a squid?

Four of the following events are part of both meiosis and mitosis, but only one is meiotic. Which one? a) Chromatid formation b) spindle formation c) chromosome con - densation d) chromosome movement to poles e) synapsis

Is dark, highly decomposed organic matter found in soil.

The crucian carp, a Scandinavian fish, thrives in shallow ponds that freeze over during winter. While other creatures in the pond does from lack of oxygen, these carp are able to obtain energy through a biochemical pathway that does not require

Tulang rusuk yang bersambung dengan tulang punggung tetapi tidak berhubungan sama sekali dengan tulang dada

Animals can undergo lactic acid fermentation. A) true B) false

1 What is the structure enters and leaves that regulates what the cell?

Sharks and their relatives are the first group of animals with jaws. why are jaws a significant evoluntionary development