50 points
the human epithelium contains a layer of cube-shaped cells if the length height and width of such a cell is 1 micrometer what is the surface area of its cell membrane
a) 6 micrometer^2
b) 3 micrometer^2
c) 3 micrometer
d) 6 micrometer^3

The eruption of a nearby volcano causes a prairie ecosystem to receive a lot less sunlight. which of these is the most likely effect on the ecosystem? a-an increase in biodiversity. b-an increase in immigration to the area. c-a decrease in available water. d-a decrease in plant growth.

Which way do the nitrogenous bases in dna pair up? a. a and g; t and c b. a and c; t and g c. a and t; g and c d. a and a; t and t; g and g; c and c

For a comparative or experimental investigation, scientists often make a testable about a scientific question, and then they test it in the investigation. a. control b. hypothesis c. procedure d. system