During meiosis, the "shuffling" exchange of genetic material is called
a. crossing-over.
b. synapsis.
c. allele distribution.
d. tetrad formation.

Identify the type of energy used in each action. the flexing of an arm muscle: a signal transduction process by a neuron: a ball at the top of a hill: 1. electrical energy 2. mechanical energy 3. gravitational potential energy

For a comparative or experimental investigation, scientists often make a testable about a scientific question, and then they test it in the investigation. a.control b.hypothesis c.procedure d.system

Give examples of selective advantage of organism’s body part/organ