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gogolik [260]
3 years ago
5

HELP PLEASEEEEEEE guys

Biology
1 answer:
Mars2501 [29]3 years ago
6 0

Answer:

Explanation:

VE RAPIDO ES LA RESPUESTA B

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Which best describes the life cycles of moss and angiosperm?
jonny [76]

Ans. Option (IV).

Mosses can be defined as non-vascular, flowerless plants that are found in shady or damp regions and reproduce via haploid spores. During reproduction in moss, haploid male gametes or spores are released into surrounding environment that fuse with female spores to form zygote that develop into mature sporophyte.

Angiosperms are vascular, flowering plants that reproduce by seeds. During reproduction in angiosperms, haploid male gametes or pollen grains are released into surrounding environment that fuse with female gametes or eggs to form zygote that develop into seed.

Thus, the correct answer is option (IV).

7 0
3 years ago
Cytotoxic T cells can attack target cells with which of these chemical weapons?
GenaCL600 [577]

Answer:

secrete a cytokine that triggers apoptosis

Explanation:

Cytotoxic T cells secrete granzymes and perforins when targeting cells. Additionally they secrete cytokines such as IFN-, TNF-α and TNF-β that act to activate macrophages and help kill infected cells.

4 0
3 years ago
Fossil record in whales
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Answer:

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8 0
3 years ago
Read 2 more answers
In one generation, the frequency of the A allele is 70 percent and the frequency of the a allele is 30 percent. What are the cha
Fynjy0 [20]
The answer is 9%.

To calculate this we will use some <span>formulas of the Hardy-Weinberg principle:
</span><span>p² + 2pq + q² = 1 and <span>p + q = 1
where:
</span></span>

<span>p - the frequency of the A allele.
q - the frequency of the a allele.</span>

p² - the frequency of dominant homozygote (with AA genotype)

2pq - the frequency of heterozygote (with Aa genotype)

<span>q² - the frequency of recessive homozygote (with aa genotype)</span>

<span>We know:</span>

p = 70% = 70/100 = 0.7

q = 30% = 30/100 = 0.3

We need to calculate the frequency of the genotype aa:

q² = ?

Since we know the frequency of allele q, it is easy to calculate the frequency of the genotype aa:

q² = 0.3² = 0.09 = 0.09 · 100% = 9%

6 0
3 years ago
Give 3 examples of how microorganisms might demonstrate the characteristics of life.
tester [92]

Answer and Explanation:

  1. Nutrition- microorganisms are able to feed on food materials obtained from the living or dead bodies of plants or other animals. They are therefore heterotrophs.
  2. Movement- both localized and generalized movements which results in the animal moving from one point to another. e.g., using flagella, cilia
  3. Excretion- they lack highly specialized excretory organs but some microorganisms use contractile vacuoles for excretion which removes waste.

3 0
3 years ago
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