Answer:
Weather conditions
Explanation:
Food can be limited based on location, however, scientists can control what kind of food it is. Soil can be tested and experimented on. There can be a lot of it and different kinds. Space is fought over because of territories and is limited compared to how many people and animals there are. Weather is not something that can be controlled in an experiment since it is sporadic.
In my science classes, it was called a producer and or a keystone species
Muscles.
your tissue is attached to a dermis which is basically your muscle and bone so muscles is the answer
The testes is responsible for
creating sperm cells. It is the male reproductive organ found below the penis.
