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Arlecino [84]
4 years ago
9

Along the length of a river there exists a species of green sunfish. In order to provide electricity to area homes, a hydroelect

ric dam is built that separates the lower river area from a newly formed lake above. After many, many years, the green sunfish in the river and lake are sampled and found to be phenotypically very different. Which of the scenarios listed below is the best hypothesis to explain the microevolutionary changes observed?
A. directional selection
B. disruptive selection
C. stabilizing selection
D. sexual selection.
Biology
1 answer:
brilliants [131]4 years ago
4 0

Answer:

A. directional selection

Explanation:

In population genetics, directional selection also called as positive selection. In this type of natural selection extreme phenotype  is preferred over other existing phenotype. This preference case shift in allele frequency over time in the direction of preferred phenotype.

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1. During RNA processing a(n)___________ is added to the 5' end of the RNA. A. 3' untranslated region. B. a long string of adeni
Svetradugi [14.3K]

Answer and Explanation:

  1. During RNA processing a(n)<u> modified guanine nucleotide</u> is added to the 5' end of the RNA
  2. During RNA processing a(n) <u>a long string of adenine nucleotides</u> is added to the 3' end of the RNA.
  3. Spliceosomes are composed of <u>snRNPs and other proteins</u>.
  4. The RNA segments joined to one another by spliceosomes are <u>exons</u>
  5. Translation occurs in the <u>cytoplasm</u>
6 0
4 years ago
Earth is composed of layers of material with different properties. Which
Irina-Kira [14]

Answer:

mantle

Explanation:

A mantle is a layer inside a planetary body bounded below by a core and above by a crust. Mantles are made of rock or ices, and are generally the largest and most massive layer of the planetary body. Mantles are characteristic of planetary bodies that have undergone differentiation by density. All terrestrial planets (including Earth), a number of asteroids, and some planetary moons have mantles.

4 0
3 years ago
Which statement is true? *
AlladinOne [14]

Answer:

B.

Explanation:

potential energy changes into kinetic energy

8 0
3 years ago
The hormones in boys responsible for producing male characteristics are Testosterone and ___ .
leonid [27]
The primary hormones involved in  the functioning of the male reproductive system are follicle stimulating hormone (FSH),Luteinizing hormone (LH) and Testosterone.

Hope this helps.
4 0
3 years ago
Are performed to assess the adequacy of the amount of oxygen getting to the heart muscle
Crazy boy [7]
The correct answer would be stress tests. These are performed to assess the adequacy of the amount of oxygen getting to the heart muscle during exercise and at rest. With this, the absence or presence of a heart disease can be indicated. This is a common procedure done in Cardiography and Cardiovascular Monitoring Services. During this test, the patient is asked to do exercises usually using a treadmill while the patient is hooked on an EKG or electrocardiogram machine. As one exercises, the doctor would monitor the heart rate reading the systole and the diastole. There are also imaging tests to be able to capture pictures of the blood flow in the heart.
6 0
4 years ago
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