Certain gases in the atmosphere trap heat on Earth.

What is the name of this phenomenon?

the greenhouse effect

cooling period

global warming

glacial melting

Why are bacteria needed in the nitrogen cycle? Other living things cannot use atmospheric nitrogen. Other living things cannot use the nitrogen in plants. Bacteria are the main nitrogen reservoir. Bacteria are the main nitrogen transporters.

Blood is often collected in what capillary tubes rather than plain capillary tubes to prevent clotting of the blood

DNA is a nucleic acid polymer composed of wh nucleotides phosphate groups ribosomes proteins

In a cladogram, what occurs at a node? A derived trait appears. Evolution is stopped. An ancestor dies. The cladogram ends.

If an aerobic organism were fed each of the following four compounds as a source of energy, the energy yield per mole from these molecules would be in the order: A. alanine > glucose > palmitate B. glucose > alanine > palmitate C.

Primates are distinguished from other mammals by having: A. longer pregnancies & periods of infant dependency. B. aquatic capabilities. C. shorter periods of dependence on parents. D. giving birth to live young

Short reflexes of digestion involve the glossopharyngeal and vagus nerves. a. True b. False

The neuron and muscle fiber membranes do not actually touch but are separated by a fluid-filled gap

Carbon is important to living things because A) it is abundant on the earth's surface. B) it metabolizes easily, creating a quick energy source. C) it has twelve protons and nuetrons. D) it can form four covalent bonds with other atoms

Which of the following characterizes do all of the outer planets have in common