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

This is a coral reef ecosystem. many biotic and abiotic factors affect the health of this ecosystem. which set correctly pairs a biotic factor and an abiotic factor?

Plz ! a scientist wants to produce a cow that makes a particular human protein in it’s milk the desired protein causes blood to clot and can be used to treat hemophilia (a blood clotting disorder). which of the following would be best for the scientist to use? a. genetic crosses. b. cloning. c. selective breeding. d. genetic engineering.

Which of the following typically characterizes a tropical rainforests