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Trava [24]
2 years ago
7

Helper t-lymphocytes secrete ________ to stimulate the proliferation of b-lymphocytes.

Biology
1 answer:
zysi [14]2 years ago
7 0
There are choices for this question namely:

<span>A) Antigens
<span>B) Antibodies
</span><span>C) Cytokines
</span><span>D) Agglutinins
</span><span>E) A<span>llergens

The correct answer is "cytokines". These helper T cells secrete cytokines that will stimulate the B cells into differentiating to plasma cells. These plasma cells will then produce antibodies to combat the offending agent depending on the antigen presented.</span></span></span>
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After its formation, Earth was extremely hot. Which of these contributed to the cooling of Earth?
MariettaO [177]

Answer:

The answer is D

Explanation:

When absorbed energy is released back into space, Earth cools. Many factors, both natural and human, can cause changes in Earth's energy balance, including: Variations in the sun's energy reaching Earth. Changes in the reflectivity of Earth's atmosphere and surface.

6 0
2 years ago
Match each scenario with the correct component of natural selection
Snowcat [4.5K]

Answer and Explanation:

On Average, sea turtles lay about 110 eggs in a clutch. However, only a fraction of the baby turtles make it to the ocean. Then, an even smaller number have offspring of their own - Overpopulation

While all zebras have stripes, no two zebras share the same stripe pattern -Variation

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2 years ago
A micrograph of dividing cells from a rat, a diploid animal, shows a cell where 21 pairs of sister chromatids are being pulled a
Elanso [62]

Answer:

<h2>b) Anaphase II of meiosis </h2>

Explanation:

1. Meiosis is the process of cell division in which one cell is divided into four daughter cell, each contains equal number of chromosome, half the number of chromosomes as compared to parental cell.

2. In meiosis I, DNA duplication occurs but the sister chromatids are not separated, only homologous pair of chromosomes are separated, so this is called reductional division.

3. In meiosis II, chromatids are pulled apart and and are separated into different chromosomes, so it is called equational division. There is no DNA duplication in meiosis II.

8 0
2 years ago
Which of the following statements are observations about the photo on the right? Check all that apply. Three boys are wearing gr
tia_tia [17]

Answer:

three boys

most of the children

the grass

Explanation:

5 0
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Which layer of the eye contains the sensory receptors for sight?
WARRIOR [948]
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