Which of the following is a true statement about osmosis?

a.
osmosis is diffusion of sugar molecules across a membrane.

b.
osmosis is diffusion of water molecules across a membrane.

c.
osmosis is diffusion in plants cells.

d.
osmosis is diffusion in animal cells.

This is a coral reef ecosystem. many biotic and abiotic factors affect the health of this ecosystem. which set correctly pairs a biotic factor and an abiotic factor?

25) a student takes four samples of a white crystalline solid and places each in a well plate. on top of each sample, she carefully places 20 drops of clear mystery liquids a, b, c and d. her results for each well are: liquid a: the solid dissolves quickly. liquid b: the solid appears unchanged. liquid c: a brownish colored liquid is produced. liquid d: fizzing occurs and the well becomes warmer. in which well does a physical change occur?

Which plains area lies in both the united states and canada? altiplano central canadian shield coastal plains great plains