Which event occurred 4.6 billion years ago?

Where can cells that are able to differentiate be found?

The sneezing, runny nose, and itchy eyes associated with allergies are caused when A. smooth muscles reduce the size of air passageways in the lungs. B. the immune system attacks the body's own cells. C. mast cells release histamines. D.

Myoglobin is a molecule within muscle cells that can bind

Equation for photosynthesis

The stomach functions to Group of answer choices dehydrate materials prior to sending them to the next segment of the tract. store food material for later use, as fat. absorb most of the nutrients from foods.

What is unique about dogs?

3. The best thing you can do to keep a positive relationship with your supervisor is to

What contains both communities and ecosystems?

Which of the following represents a way that animals in a zoo are influenced by their environment? a. increased natural instincts b. decreased aggression c. unnatural behavior d. increased appetite

when the process of mitosis is correctly completed, the daughter cells should contain exact copies of all of on organisms genes. which biomolecule contains all of the organisms genes