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Within a plant, photosynthesis is critical. It provides cells with the glucose they need for
energy. Photosynthesis is important for another reason, too. It's part of the flow of carbon
through organisms and the environment. This cycle, known as the carbon cycle, is essential
for life on Earth. It includes several processes that are occurring all the time. When plants
photosynthesize, carbon is removed from the atmosphere as carbon dioxide. When animals
and plants use cellular respiration, carbon is released into the atmosphere as carbon
dioxide. Organisms that die and are buried for millions of years turn into fossil fuels, which
are made of carbon. When humans burn those fossil fuels, carbon is released into the
atmosphere as carbon dioxide. Without enough carbon dioxide in the atmosphere, the
planet would be too cold. But too much carbon dioxide contributes to the warming of the
planet that could make it too hot to survive.
Based on the passage, what is one reason that the carbon cycle important?
A It adds carbon into the atmosphere whenever the level begins to drop too low.
B
It helps maintain a level of carbon in the atmosphere that is neither too hot nor
too cold.
с
It removes carbon from the atmosphere whenever the level begins to become
too high.
D
It releases carbon into space, preventing it from building up in Earth's
atmosphere.

Answer:

B

Explanation:

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Do you think wolves are a keystone species? Explain your answer

According to the USDA, a "consists of a community of individuals who pledge support to a farm operation so that the farmland becomes,

either legally or spiritually, the community's farm, with the growers and consumers providing mutual support and sharing the risks and benefits

of food production."

-sustainable operation

-farmers' market

-farmers' cooperative

-CSA

Identify landform B, explain how it forms, and tell whether it is the result of erosion or deposition.

Which of the following is an example of a positive feedback loop:

I. As the Earth’s surface warms due to global warming, water evaporation from a lake will initially increase.  As the lake level drops, the surface area decreases and evaporation also decreases.
II. Water vapor from ocean evaporation creates low altitude clouds.  Sunlight that would normally warm the Earth’s surface is instead reflected back to outerspace.
III. Water vapor from ocean evaporation creates high altitude clounds.  Heat that would typically escape the atmosphere into outer space is trapped in the atmosphere instead.

I only

II only

III only

I and II.


I, II and III

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A stream that flows into two different rivers is part of two
A reservoirs.
B. tributaries.
C. divides.

D.
watersheds.

Results from multiple experiments suggest that the ActA protein of Listeria, an integral membrane protein expressed on the cell surface, is the only bacterial protein that is required for the movement of the bacterium within its host cell. Which combination of the following observations shows that ActA is both, necessary and sufficient for bacterial movement?

I. ActA binds to the Arp2/3 complex
II. E. Coli in which ActA is expressed moves in host cell cytosol
III. Listeria lacking the ActA gene fail to move inside the host cell cytosol.
IV. ActA has 3 transmembrane domains
V. Arp2/3, when activated, nucleates a branched actin network

a. I and II
b. II and III
c. I and III
d. III and IV
e. I and V

Once all the members of a ____ have this favorable traits then it is refferred to as an _____