That statement is false
The plants still have to undergo a fierce competition in order to obtain sunlight. The taller trees will obtain more sunlight while overshadowing the smaller one.
Meanwhile , even though there are a lot of food resources in the rain forest, it also have many animals that compete for the same food.
Brick is not a mineral (it is man-made)
The answer is A.
the researchers would not be able to compare the samples and cut the DNA when samples from the waterway are not collected.

Nitrogen-fixing bacteria fix atmospheric nitrogen to ammonia, which can then be taken up by plants.
- The process is called biological nitrogen fixation.
- Rhizobium, Azotobacter, cyanobacteria are some examples of nitrogen-fixing bacteria, which may be free-living or symbiotic.