Which of the following are considered the most effective types of reward?

a. noise and water b. rest and isolation c. food and praise d. light and sound

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

There are specialized producers that live in warm water vents deep in the ocean. these producers do not per-form from photosynthesis, but instead perform a similar process with iron and other chemicals. why do you think these producers use this process instead of photosynthesis?

How does buring fossil fuels impact does carbon cycle? what large impact does this have on the envirnment?