The process by which infectious disease occurs is known as the

1. the is the thinnest part of the earth. 2. the is the thickest part of the earth. 3. what metals are mentioned in the text?

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

Which is an example of a vestigial structure? a. tail of a monkey b. fin of a fish c. flower of a plant d. tailbone of a human