BIOLOGY MIDDLE SCHOOL

The Milky Way is held together by a black hole's gravitational force. Since the stars near this black hole move at a high speed, what can youinfer about the black hole?
A. Its location
B. Its size
C. Its depth
D. Its speed

Answers

Answer 1
Answer:

Answer:

B. Its size.

Explanation:

The black hole pulls the star as it passes across it.

This pull force of the black hole is due to its gravitational force, which depends on its size. It is assumed by scientists that the black hole is enormous.

The higher is the size of the black hole, the higher will be the gravitational pull  (as only then it can generate high pull force).

So, the correct answer is B. It's size.

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What is a fine-grained material that has been transported and deposited by the wind ? A. Loess

B. Sandblast

C. Slip face

D. Sand dunes

Answers

Answer: Loess is the fine grained material that has been transported and deposited by the wind.The answer isA.

Explanation:

Since the wind can carry these types of material (find grained) father than sand, and also higher up, they are generally found very far from their original place of origin.

Loess is no larger than 50 micrometers in size. It is coarse in texture like clay, but finer than a grain of salt.

If a pea plant's genotype is Tt, what is its phenotype

Answers


It depends on the representation of Tt.  Does this represent height?  If so, it's phenotype would be tall, because Tt is still dominant

Its phenotype would be tall.

Which of the following lists include only abiotic factors?a. sunlight, rainfall, soil
b. plant roots, rainfall, temperature
c. Sunlight, soil ph, native animals

Answers

A is the correct answer

6. What is the main function of the green pigments (chlorophyll a & b)?

Answers

Answer and Explanation:

Chlorophyll a is the most used photosynthetic pigment and absorbs blue, red and violet wavelengths in the visible spectrum. It participates mainly in oxygenic photosynthesis in which oxygen is the main byproduct of the process. Chlorophyll b primarily absorbs blue light and is used to complement the absorption spectrum of chlorophyll a by extending the range of light wavelengths a photosynthetic organism is able to absorb.

Both of these chlorophyll molecules capture light energy and transfer it to the reaction center of the cell. Henceforth, electrons are passed from this absorbed light energy to water molecules resulting in the formation of hydrogen ions and oxygen atoms.

Many higher organisms must maintain a strict internal temperature. There can be serious consequences if the internal temperature deviates even slightly. What is the name of the process which controls the internal temperature? A) osmosis B) homeostasis C) chemosynthesis D) warm bloodedness

Answers

Answer:

Homeostasis (Ans.B)

Explanation:

Homeostasis is defined as the ability of an organism which can maintain a stable, and constant internal (temperature) environment in the body.

If our body gets too high or too low temperature sensors present in the periphery and brain tells the temperature regulation center of our brain in a region is known as hypothalamus that our body temperature has strayed from its point.
B. Homeostasis . homeostasis is the process via which organisms maintain their internal milleu.

1.Having spent much time in sunlight during youth, an older person develops skin cancer and has the growths removed. What environmental mutagen causes the growths to keep coming back AND why might the growths keep coming back?2.Is a mutation that happens during meiosis likely to affect a single gene or an entire chromosome? Explain.

Answers

1. remaining skin cells still have the mutation that causes the cancer in their DNA, even if the symptoms are removed

2. it is likely to affect an entire chromosome because during meiosis there may be errors in crossing over when the condensed chromosomes can exchange large parts of the chromosomes in error
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