According to the fossil record, when did the dinosaurs become extinct?

A

at the start of the Mesozoic Era

B

at the start of the Paleozoic Era

C

at the end of the Mesozoic Era

D

at the end of the Paleozoic Era

Numerous changes in the integumentary system occur during pregnancy. which change persists after birth?

Why is there equal amounts of cytosine and guanine and equal amounts of adenine and thymine in the DNA of a cell?

All living things have DNA in their cells, but not all living things have ribosomes. a. True b. False

The existence of Pangea is supported by evidence that similar fossils appear on differen continents. How does this observation support the existence of Pangea? 1) It shows that fossils can be relocated.

The elastic epithelial fold of variable size which partially blocks the entrance to the vagina is called the

What is a carbon footprint? A. A measure of how much carbon dioxide someone releases into the air B. A measure of how much carbon is fixed by bacteria C. A measure of how much carbon a person absorbs in their life D.

Why doesn't the stomach digest itself? a. the stomach wall is not composed of protein, so it is not affected by proteolytic enzymes. b. the digestive enzymes of the stomach are not strong enough to digest the stomach wall. c.

States that genetic information flows in one direction

Suggest ONE reason why some plants have no dispersing seeds

Which of the following is a possible order of the scientific method