A population is
A.
all individuals of a single species that exist together in a given region.
B.
all similar animal species that live in the same ecosystem.
C.
all plant species that exist in a single region at a single time.
D.
the sum of all individuals of a species that live in different ecosystems.

An easy way to calculate the amount of energy available at each level is to what?

Diagram of the evolution of land plants?

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.