A theory by which prokaryotes gave rise to the first eukaryotic cells. Chloroplasts in plants and mitochondrion in other eukaryotes are believed to have once been prokaryotic organisms engulfed by larger prokaryotic cells.

Which activity produces the smallest amount of greenhouse gases? driving a car riding a bicycle cooking with gas operating a generator

Which type of fault causes land to move downward? A) sliding fault B) strike-slip fault C) reverse fault D) abnormal fault E) normal fault

Which of the following statements explains how carbon enters the soil during the carbon cycle? A. / Carbon enters the soil when decomposers produce it. / B. Carbon enters the soil when organisms die and become fossilized / C.

Describe one limiting factor for the moose population

Enzymes act as catalyst because ... They raise the activation energy They lower the activation energy They use activation energy They maintain activation energy

The nurse is educating the parents of a 5-year-old girl with infectious conjunctivitis about the disorder. which information is most important to provide to prevent the spread of the disorder

Which is an example of the way matter cycles through the bodies of living things? A) A fish swims in the ocean. B) The sun heats up a rock. C) One animal eats another animal. D) Trees convert sunlight to energy.

Which of the following substances is used up during photosynthesis? Oxygen Sugar Sulfur dioxide Water

What is the role of mouth

Which atoms are found in all carbohydrates?