Choose two ways carbon returns to nature from animals Question 1 options:

A. Animals do not return carbon to the atmosphere

B. When animals breathe, they breathe in oxygen

c. When animals die, their remains are recycled by decomposers, releasing carbon into the soil.

D. When animals breathe, they release carbon dioxide.

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next

In vapor-liquid equilibrium in a binary mixture, both components are generally present in both phases. how many degrees of freedom are there for such a system? the reaction between nitrogen and hydrogen to form ammonia occurs in the gas phase. how many degrees of freedom are there for this system? steam and coal react at high temperatures to form hydrogen, carbon monoxide, carbon dioxide, and methane. the following reactions have been suggested as being involved in the chemical transformation:

The chemical formula for emerald is be3al2(sio3)6.an emerald can be decided as