What element is most important for adding strength to hair, feathers , and outer skin? a. oxygen b. hydrogen c. sulfur d. phosphorus

Which of th following best describes how genes produce traits in an organism?

Forensic scientists think they know the identity of a skeleton. what rule should they use to select a relative whose dna could be used to try to confirm the identity?

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