The number of individuals of a single species per unit area is known as

What are atoms made of? A. Smaller molecules B. Smaller Atoms C. Subatomic particles D. Proton clouds

What did the haikouella, a primitive early chordate fossil, lack that vertebrates have?

Why the ocean have salty?

is a group of cells that work together to perform a specific function.

What is the essential feature of science that makes it different?

Randy is sledding down a hill away from his sister, Leslie, who is standing at the top of the hill. At first, Randy moves at a constant speed down a nearly flat part of the hill.

Which of the vitamins is directly linked to the diet of calcium in our body?

What are issues with animal research involving animals bred in a breeding colony?

What type of cell division happens to produce new body cells?

What are the reactants in cellular respiration? what are the products?