Can a pure substance be an element or compound

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

The allele for curly hair is incompletely dominant. if a mother is homozygous for curly hair and the father is homozygous for straight hair, what percentage of the offspring will exhibit characteristics of both parents? 25 percent 50 percent 75 percent 100 percent