Answer:
Explanation: In facilitated diffusion, molecules diffuse across the plasma membrane with assistance from membrane proteins, such as channels and carriers. A concentration gradient exists for these molecules, so they have the potential to diffuse into or out of, the cell by moving down it.
Answer:
D. cell, tissue, organ, organ system, organism
Explanation:
also before cells there are also (and in order) atoms, molecules, organelles
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For a non smoker it's four days in the urine
Answer:
Some plants absorb all the nutrients in the soil, like the cotton plant, and some return them to the soil, like peanuts. The latter plants are called nitrogen-fixing plants. Rotating these and the former plants (like cotton), replenishes the nutrients in the soil and creates a healthy agricultural cycle.
This mammal is found in open and semi-open habitats, especially grasslands with scattered bushes and trees, in south, central-west, and southeastern Brazil, Paraguay, northern Argentina, Bolivia east and north of the Andes,[4] and far southeastern Peru (Pampas del Heath only).[5] It is very rare in Uruguay, possibly being displaced completely through loss of habitat.
