How do plants obtain nitrogen?

A. They remove it from the air.

B. They absorb it through their roots.

C. They fix it in their leaves.

D. They produce it in their stems.

What is the ultimate source of genetic variability? A. Gene flow B. Mutations C. Genetic drift D. Non-random mating

Communities make up a major component of an ecosystem. true false

What particles could diffuse easily through a cell membrane?

Define population. How is a population different from a community

Osmoisis and diffusion are both examples of

How many significant figures should the products 62.25 37.4 have

How can biotechnology decrease or increase variation?

Photoperiodism and flowering use the data in the table below to determine whether each plant is a short-day plant, a long-day plant, a day-neutral plant, or a plant that cannot be classified based on the data. description plant a plant b

The alkali metals make up which group of the periodic table?

What is the most important mechanism through which combined oral contraceptives prevent pregnancy?