Answer: Land: Denser materials sank to the earths center and less dense materials were forced to the outer layers, forming a thin crust. Atmosphere: Less dense molecules rose to the surface. Oceans: As earth cooled, water vapor condensed to form rain which lead to the formation of oceans.
1.<span>it stores the cell's hereditary material
2.</span><span>folds protein molecules in sacs
3.</span><span>are a cell structure that makes protein</span>
Answer:
D.) crossing over causes alleles of genes to be switched between homologous chromosomes.
Tetracyclines are antibiotics used against a wide range of microorganisms, such as bacteria, chlamydia, rickettsia and some protozoa parasites.
<span>They inhibit synthesis of protein in bacteria by inhibiting the binding of transport RNA and ribosome and</span> are effective against both gram-positive and gram-negative bacteria.
