7. What is an index fossil?

Which element is used in photosynthesis found in atmosphere and fixed by bacteria?

What type of cell is produced after fertilization occurs and the gametes combines ?

You arrive late to a biological seminar. however, just as you enter the room, you hear the speaker referring to the "five-prime end" and the "three-prime end" of a macromolecule. immediately, you know that they are talking about a: ]