DNA was found to contain only four different chemical building blocks.
Answer:
B, C, D
Explanation:
The following statements are true regarding the continental crust;
It is between 25 and 70 km thick
Its made of all types of rocks
It contains silicate minerals high in sodium, potassium, aluminum, and calcium
<span>Cytosis requires energy, and the production of energy depends on oxygen. Diffusion does not require energy.</span>
It is a type of transport molecule