It would be the fossils amount of mineral acidity im pretty sure!
Endo = enter
This means when things enter into the cell, I hope this helped
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.
The hair would be curly because if h is recessive and H is just curly, that hair is gonna stay the same.
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