Where do clouds form? select three options.

a. at the ground
b. in the upper atmosphere
c. near the earth’s surface
d. where the air has very low humidity
e. where the atmosphere contains few particles

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

Chlorophyll is found in plant leaves and absorbs light from the sun to enable plants to perform photosynthesis. magnesium is an important component of chlorophyll. the concentration of magnesium ions is higher in the root-hair cells of plants than in the soil. which mechanism of ion uptake would best enable a plant to produce a steady supply of chlorophyll? osmosis diffusion passive transport active transport

Number and variety of living organisms includes genetic, species, and ecological types