The formation of which of the following cannot be explained by the nebular model?
a.
the sun
c.
the milky way galaxy
b.
the planets in our solar system
d.
comets and asteroids

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

The carrier molecules of the electron transport system are located in the

Abiologist counts the number of rabbits in a population each year and observes a decrease in population. since the coyote population has exploded, the biologist concludes that the coyote population has had a negative interaction with the rabbit population. which describes the biologist’s actions? a.) experimentationb.) inferencec.) observationd.) interacting