Why is a stimulus required for a muscle to contract?

How can a lake cause a population to become separated?

How do you call a prokaryote kingdom that typically live in oxygenated environments, and are not as adapted to harsh environments as the other prokaryote kingdom?

Identify the controlled variable

During meiosis, sister chromatids are separated and move toward opposite ends of the cell as the centromeres that hold them separate. Which of the following processes will begin next?

True or False; phytoplakton blooms can release toxins in the water that can accumilate in tissue of fish that humans eat

Which organism's are omnivores? A) The snake, the bear, and the fish B) The fish and the eagle C) The bear and the fish D) The snake and the mouse If an omnivore is an animal that eats both plants and animals, I'd choose D because all the other

How are all humans similar?

Why does earth have such a diversity of plant and animal life? give three reasons.

After sequencing a molecule of dna, you discover that 20% of the bases are cytosine. what percentage of the bases would you expect to be thymine? explain why.

Kidneys that can conserve water are essential to homeostasis because: a) some animals live in dry or salty environments. b) some animals drink water.