Which organism can be thought of as a pioneer species during primary succession, even though they are really a symbiotic relationship between fungi and algae?
a Lichen
b Moss
C Fern
d Plankton

Robert wants to know which fertilizer will work the best for his grass. what can he do to explore this inquiry?

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

Cedric has a low fever and minor aches. yesterday, he went to the doctor for his booster shot and receive the flu shot. which best explains why he has this reaction?