They convert energy from the sun into usable chemical energy by the process of photosynthesis. they are

a) producers
b) primary consumers
c) decomposers

well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.

population. population is the number of people or animals in a particular place. an example of population is over eight million people living in new york city.

here is your answer hope i .

a compound light microscope is used to magnify objects in steps.  

hope it