Which cells in the body receives information from external stimuli?
A) Cartilage Cells
B) Muscle Cells
C) Glandular Cells
D) Nerve Cells

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

Dna. we have heard that we are a product of our dna. but where is it? how do we "get" our dna? it is passed to us, from our parents, but in what form? several vocabulary words associated with inheritance are used interchangeably and sometimes, incorrectly. let's see if you can clear this up for someone just learning about inheritance and cell structure.

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?