Which of the following poses the greatest risk for species extinction?a.
expansion of human cities
b.
increased levels of pollution
c.
intense hurricane activity
d.
UV radiation and the hole in the ozone layer

Answers

Answer 1
Answer: a expansion of human cities
Answer 2
Answer:

expansions of human cities because it happens directly takes away where they live. pollution is a negative but not as life threatening. Hurricanes dont happens over and over again in the same area in a small period of time unlike human expansion and the uv radiation is affect us humans too.


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Some types of bacteria are able to perform photosynthesis. these bacteria must therefore contain.

Answers

...Chloroplasts. These allow cells to perform photosynthesis. 
Chloroplast. This is what allows for organisms to use sun energy to make glucose

The flat portion of a valley floor adjacent to a stream channel is called a

Answers

A floodplain is the flat portion of a valley floor. It is located adjacent to a stream channel. It is very prone to flooding and is flat but has areas of higher elevation on both sides.

Answer:

A floodplain is the answer

Which of the following is not a major function of the roots? A. Development of root pressure that drives movement B. Uptake of nutrients C. Photosynthesis D. Providing a membrane in which osmosis moves water across

Answers



who needs roots and what good have they done to you? movement- no when roots cone out they come out vertically in the instance that they do not have movement

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it was c  photosynthesis just took the test    Exam Number 700158RR                      find this numbers test an u will have all of your answers Grade 90Date Graded 07/05/18 *Eligible for Retake Until : 08/04/18
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 Question NumberYour AnswerAnswerReference 1.BCorrect 2.BCorrect 3.CCorrect 4.CIncorrectSection 4.1 5.DCorrect 6.ACorrect 7.ACorrect 8.DCorrect 9.DIncorrectSection 4.3 10.BCorrect 11.BCorrect 12.ACorrect 13.ACorrect 14.CCorrect 15.BCorrect 16.CCorrect 17.CCorrect 18.CCorrect 19.BCorrect 20.CCorrect
Questions Answered Incorrectly

4.   Which of the following structures are found in gymnosperms but not in angiosperms? A. Cones B. Pollen C. Flowers D. Seeds
Student Answer: C  
Answer: IncorrectReference: Section 4.1

9.   Which of the following does not accurately describe fruits? A. Fruits provide nourishment for seedlings. B. Fruits attract animals, which helps disperse seeds. C. Fruits are rich in sugars. D. Fruits develop from ovary walls.
Student Answer: D  
Answer: IncorrectReference: Section 4.3


Which of the following best describes what can affect enzyme activity?

Answers

Temperature, pH, enzyme concentration, substrate concentration, and the presence of any inhibitors or activators can affect enzyme activity.

The use of wells to obtain drinking water is a modern convenience

Answers

Answer:

This is not true

Explanation:

Wells were used in olden days to store and use water. During those days mechanical pulleys were used to extract water out of wells but now a days modern pumps and lifting equipment are used for bringing underground water to the users.

These days water is supplied through pipes and no traditional bucket or rope is used for pulling out water out of the ground. Though wells exists even today but its usage as a primary source of fresh drinking water is no longer in system but rather they are preferred as water storage units.

Answer:

The use of wells to obtain drinking water is not a modern convenience. It might have been a convenience in the past, but with our technological advancements, the use of wells aren't that popular anymore. It is not disregarded though that the usage of wells aren't dropping to a stop since they are still utilized by people usually living in the rural areas. As for the convenience part, well it isn't as convenient as it seems since establishing the well itself would take so much work.

Explanation:

hope this helps

Which two biogeochemical cycles depend directly on photosynthesis?

Answers

The answer is "The oxygen cycle and carbon cycle".

In Earth science, a biogeochemical cycle or substance turnover is a pathway by which a synthetic substance travels through both the biotic (biosphere) and abiotic (lithosphere, air, and hydrosphere) parts of Earth.