El átomo de este ciclo tiene varias rutas por las que circula entre el medio ambiente y los seres vivos. Una de estas rutas se da cuando un organismo aerobio exhala y las plantas lo captan del aire y lo convierten en carbohidratos.

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

Can bacteria reproduce in a way such that when you start out with two bacteria, you get five bacteria? why or why not? * a. yes, because bacteria reproduce sexually, and can produce any number of offspring, just as humans do. b. no, because bacteria grow at an exponential rate. c. no, because when bacteria reproduce, they split into two parts, and two bacteria splitting would result in four bacteria.

Which of the following best describes the purpose of the parathyroid hormone? a. it decreases the blood calcium level and decreases blood phosphorus level. b. it decreases the blood calcium level and increases the blood phosphorus level. c. it increases the blood calcium level and increases blood phosphorus level. d. it increases the blood calcium level and decreases blood phosphorus level.