Transport of materials into a cell against a concentration gradient, from low to high, requires a) water. b) energy. c) osmosis. d) a passageway.

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

Select all that apply genes are specific nucleotide sequences occur in numbers that are the same as the number of chromosomes are located in a specific place on a chromosome determine the traits of an organism are units of rna

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants.d- food molecules are broken down in the cells if living things.