What systems is for this interaction which is: Lungs supply oxygen carried by blood to cells of the body,

2points what is the term for a female reproductive cell? a. egg b. chromatid c. allele d. fertilization

Hydrogen has only one electron in its only (and outer) electron shell. if a hydrogen atom were to absorb a small amount of energy, where would bohr say the electron would go? a. fly off the atom b. nowhere, it would just speed up. c. spiral inwards towards the nucleus d. move up to another shell that would form

Can an organism fill more than one trophic level?