Which cannot take place during a chemical reaction?
question 27 options:

formation of new atoms

bonds breaking between atoms

formation of new molecules

bonds forming between atoms

Where do homologous chromosomes exchange genetic material through crossing over?               a.  chlorophyll    b.  centrosomes    c.  centromeres    d.  chiasma

Are the earth's ocean floor and continents the same age geologically? why or why not?

Viruses can be transmitted through air, water, food, insect bites, and direct skin contact. once a virus gains entry into the body, it invades a host cell in order to? a. synthesize antibodies for defense b. deactivate the host cell's defenses c. access cell processes for reproduction d. metabolize host proteins and grow