Answer:
A microscope
Explanation:
He observed through a microscope and discovered cells.
Hey there!
Your answer is option B.
Alleles are two forms of single genes.
Hope this helps you.
Have a great day (:
Answer:
A. A resource that is so scarce (in restricted quantity) that it limits the size of a population is called a limiting factor. Any single resource can be a limiting factor to a population size. For example, the amount of water available can affect the number of plants that can grow in an area.
