The conditions on earth around the time of the of the molecules present were likely produced by volcanic eruptions. critical formation of small molecules containing which of the following? origin of life were very different from those of today. most to the origin of life was the
a. nitrogen and methane
b. oxygen and hydrogen
c. sulfur and carbon
d. ammonia and methane
e. carbon and hydrogen

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

Mutations associated with albinism affect proteins involved in synthesis

Plz ! cattle ranchers and dairy farmers rarely allow all of their animals to reproduce instead they practice selective breeding and only encourage the reproduction of animals with specific features. which of the following cows would a dairy farm most likely choose to reproduce? a. a cow that makes a lot of milk. b. a cow that can run quickly. c. a cow with a think, soft fur. d. a cow with large, strong hooves.