3. Which biome has the greatest species richness? desert
tropical rainforests
freshwater aquatic
temperate deciduous forests
coral reefs
4. If a plant species is endemic to Mt. Kilimanjaro, what does that mean?
The plant is naturally found on Mt. Kilimanjaro and wasn't introduced by people.
The plant is found on Mt. Kilimanjaro, but it isn't native.
The plant used to live on Mt. Kilimanjaro but is now extinct from that area.
The plant naturally grows only on Mt. Kilimanjaro and nowhere else in the world,
The plant is only found on very high mountains.
5. Which of the following is true about deserts?
They are only found in tropical regions.
They're mostly just sand with maybe a few cacti, lizards and snakes.
On a per-acre basis, they are the least productive biome on Earth
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4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."    

layer 3 is younger than layer 6.

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.

a bird that nests only in a particular tree species.