Gabriel is at a stage where his body is changing physically; he is growing facial hair and building muscle. He is also just starting to make sperm.

What is most likely Gabriel’s age:
A) 5
B) 12
C) 17
D) 21

About __ of the mass of the cell is water

The most famous fossil called archaeopteryx is which of the following? a dinosaur a fern a fish a bird

Pls me i need this ! each cell has genes activated depending on it's job and what kind of cell it is. it is the presence of that causes the repressor protein to fall off and unblock the gene on the lac operon. if a gene is turned on then it is being an additional circular chromosome found in some bacteria that is used in genetic engineering.