About how many times does your heart beat in a day? In a year?

Scientists decide the age of different rock layers by the things that they uncover in the rock. Which of the items below could scientists use to date a layer of rock? A. an insect flying near the dig site B. a fossilized fish C.

Which feature of the lung cell allows oxygen to pass through quickly? Choose one answer. A: It is thin B: It has a large nucleus C: It has many mitochondria

What is the form of a trait that seems to disappear in population

All BUT one is a function of the cell wall. That is

Which type of population is most likely to suffer death as a result of disease? a. a large population living in a large area b. a small population living in a large area c. a large population living in a small area d.

A deletion of one base in the original segment of DNA is called a frameshift nutation what will happen to the newly synthesized protein as a result

4. Is predation a density-dependent or density-independent factor?

Why do you think a fracture involving the bones of the nasal cavity could affect the cranial cavity?

Which structure in a cell makes protein

Do Genes make up chromosomes.