What was the significance of collisions of dust, rock, and ice during earth’s formation?
a. to modify the density of materials present on earth
b. to facilitate heat absorption from the surrounding space
c. to blow away a strong burst of particles from the first atmosphere
d. to harden materials to form different parts of earth’s layers

If animal agriculture was eliminated, how much grain would become available for human consumption?

Wich level of organization includes all the other levels or organizations

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.