Which of the following is a component of the plasma membrane that creates a chemical barrier between the inside and the outside of the cell?

cholesterol

water

proteins

phospholipids

One tank of goldfish is feed once a day, a second tank twice a day, and a third tank four times a day during a six-week study. the fishes' body fat is recorded. what is a controlled variable? a. body fat of fish b. type of goldfish c.

You are charged with securing a site to build a wind farm as you survey different potential sites you look for the one that

A type of trilobite is used as an index fossil these fossils were made about 540 million years ago a scientist finds a trilobite fossils in layer 5 apex

What is legnth and width of a human?

What contributes to the high level of biodiversity found in wetlands? a. the large amount of available organic matter to organisms that are food for larger organisms b. the amount of available water for organism use c.

What organelle is most specialized?

What is the body of a sponge is covered with many small opening?

Population Growth Which of the following refers to the movement of individuals out of a particular area? A. Immigration B. Emigration C. Transporting Population growth is a big concern for ecologists.

How does a caterpillar get it's energy?

What do scientists think forms the Moon's core?