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4 years ago

Select each correct answer:

Biology

2 answers:

n200080 [17]4 years ago

4 0

Allowing livestock to overgraze a region leads to desertification of land

Explanation:

Desertification is the conversion of a once fertile vegetative land to a barren land due to environmental changes. Many human activities and practices are often the cause of desertification of fertile lands.

Overgrazing plays a major role in desertification of lands. When huge number of farm animals is made to graze over vast lands, the entire vegetative cover will be lost.

When there is less protective vegetative cover, then the land becomes dry and barren allowing very less infiltration of ground water which reduces moisture content of the soil. This finally results in land becoming dry and deserted and the precipitation also becomes less. All these conditions recycle and reduce the vegetative growth.

Unsustainable agricultural practices like growing heavily or intensive farming or removing plants in a region also causes desertification, but land use by overgrazing contributes more to desertification.

Law Incorporation [45]4 years ago

4 0

Answer:

Removing all of the plants from a region, farming a region's soil heavily for many years, and allowing livestock to overgraze a region.

Explanation:

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Which of the following is TRUE about sexual reproduction? Please choose the correct answer from the following choices, and then

Marina CMI [18]

Answer:

The correct answer is A. Sexual reproduction produces a greater variation in offspring.

Explanation:

B is wrong because in sexual reproduction there are two organisms involved who combine their DNA, therefore resulting in non-identical offsprings.
C is wrong because sexual reproduction requires the two organisms involved to exchange DNA's whereas asexual reproduction involves only one organism which only copies it's own DNA for reproduction.
D is wrong because there are no risks as genetic defects and no need to seek a mate or it is easier than sexual reproduction which results in lower risks for the parents in asexual reproduction.
E is wrong because asexual production is a more efficient procedure and results in a faster growing population because there is no need to search a mate.
The answer is A because in sexual reproduction, two different DNA's from both parents get combined resulting in more variation in offspring. In asexual reproduction, there is only one set of DNA which does not allow the gene's to mix, causing a less diverse offspring.

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3 years ago

What structures hold the air passages open in the windpipe and bronchi?

kobusy [5.1K]

<h2><em>The trachea connects the larynx to the bronchi and allows air to pass through the neck and into the thorax. The rings of cartilage making up the trachea allow it to remain open to air at all times</em></h2>

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2 years ago

Read 2 more answers

The initial stage where a perceived threat or danger is experienced. This is when physiological reaction occurs that includes he

bagirrra123 [75]

Answer: Alarm reaction stage

Explanation:

The General Adaptation Syndrome (GAS) is the 3- stage body response to stress conditions. The three stages include

1) Alarm reaction stage

2) Resistance stage

3) Exhaustion stage

Note that the Alarm reaction stage consist of arousal by the autonomic nervous system, where several involuntary responses such as sweating, tension, raised breathing etc are observed due to hormones released.

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4 years ago

What changes occur to the ratio of surface area to volume as a cell<br> grows?

seraphim [82]

Answer:

As a cell grows, its surface area-to-volume ratio decreases

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3 years ago

If a homozygous black bull is mated with a homozygous white cow and the calf is gray, this would be an example of ________. howe

I am Lyosha [343]

The first statement above is an example of incomplete dominance. If the calf has black and white spots then that’s an example of codominance.

Incomplete dominance is a form of transitional inheritance in which one allele for an explicit trait is not entirely expressed over its paired allele. This effects in a third phenotype in which the expressed physical trait is a mixture of the phenotypes of both alleles.

Codominance<span> is a form of dominance by which the alleles of a gene pair in a heterozygote are wholly expressed. This effects in offspring with a phenotype that is neither dominant or recessive. A usual example showing this type of dominance is the ABO blood group system.</span>

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3 years ago