Describe the structural make-up of a gene?

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million

Light sensitivity in euglena is provided by the

What is a food chain? a. different animals located in different communities b. energy transferred from the sun to plants and then to a series of living things c. rows of crops, such as lettuce, in a field d. animals using one another as food for energy and growth