When comparing primitive Earth to modern Earth, we note that
A. primitive Earth had more ozone.
B. modern Earth has more ultraviolet light.
C. modern Earth is cooler.
D. there is less oxygen on modern Earth.
C. modern Earth is cooler.
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You are excited because you just purchased a male guppy that has red, blue and green colors on its fins and tail. Your guppies at home do not have this combination of colors. You place the new male in with three females for mating purposes. After three weeks you have many new baby guppies and with the new color combination. This is an example of which type of selection?
A. Natural B. Environmental C. Analogous D. Convergent E. Artificial
Why is there an upper limit to the surface area-to-volume ratio in a cell?
a. The volume of the cell maximizes the use of phospholipids. b. The surface area must be sufficient to provide adequate nutrient and waste exchange to sustain the chemical activities of the cell. c. The cells require a balance between endocytosis of precursor molecules to transporters in the membrane. d. The size of a cell is limited by the number of mitochondria. e. The organelles in cells require communication with the extracellular environment to support internal functions.
LDL cholesterol is taken into the cell by receptor-mediated endocytosis
__________________ Indicate whether the statement is true or false.
Parasites kill their hosts, but predators do not kill their prey
Indicate whether the statement is true or false