Biotic forces can cause changes to the surface of Earth. Which is the best example of living organisms causing weathering? a
Salmon making nests for their eggs in a stream.
b
Tree seedlings growing and forming cracks in rocks.
c
Beavers building a dam across a stream.
d
Cattle walking and grazing in a grassland.

Check all that apply diatoms are marine algae that have a shell made of silica, what are some of the uses of the silica shell after the diatoms die? 1.the shells make up the diatomaceous earth used in filters 2.it can be used as an ingredient in abrasives 3.they are used in food products 4.the shells can be used in some insulating materials

Which group of algae is characterized by unicellular organisms and includes some members that would be better classified as zooflagellates? euglenophytes red algae sporozoans green algae

How do living things obtain phosphorus