The southern migration of which african people may have led to a significant increase in the incidence of malaria?

1 answer:

4 0

The answer is Bantu. They had already developed immunity to malaria due to exposure in their native environment. As they migrated southwards to conquer more land, they met the pygmies and the Khoisan. The Bantus had carried with them the malaria vectors. When the mosquitos infected the pygmies and the Khoisan populations, who had no immunity against malaria, the disease reduced their populations drastically hence enabling the Bantus to conquer their land.

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The "lub" heart sound is due to the Select one: a. onward rush of blood to the heart. b. contraction of aortic muscle tissue. c.

adelina 88 [10]

Answer: Option D.

The lub heart sound is due to the closing of atrioventricular valves.

Explanation:

Heart sounds are noises that are generated from beatings from heart and from blood that flows through it. The heart sound reflect the turbulence generated when the heart valves snap shut. Lub is the first heart sound also called S1 and it is caused by turbulence and closure of the atrioventricular valves(mitral and triscupid valves) at the start of systole. The second sound is the dub sound which caused by the closing of aortic and pulmonic valves at the end of systole.

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How are bony fish better adapted to a swimming way of life than cartilaginpus fish?

Romashka [77]

Cartilaginous fishes have an internal skeleton made of cartilage and their skin is covered with placoid scales.

While, The bony skeleton of bony fishes is harder and heavier than cartilage. Bony fishes have either lungs or a swim bladder and hard, thin scales.

Does this help?

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4 years ago

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Which is not an adaptation of desert animals that help them retain and acquire water in such a hot and dry environment?

rjkz [21]

C is the correct answer

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3 years ago

What is the difference between running a sam spade investigation versus searching dns records?

melomori [17]

In the case of DNS record; You launch windows command by navigating to start. -Type NSLOOKUP and then press enter. -Afterwards you enter the name you wish to query. On the other hand, Sam space is mainly run on the network and it can be used by network administrators to track down intruders and hackers.

Sam Spade for Windows offers a suite of tools for protecting against spam on mail servers, analyzing and troubleshooting web servers, and gathering information on Internet hosts.

DNS records (aka zone files) are instructions that live in authoritative DNS servers and provide information about a domain including what IP address is associated with that domain and how to handle requests for that domain.

To learn more about DNS record here

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2 years ago

Two brown eyed parents give birth to a blue eye baby. Which trait (blue eyed or brown eyed) is dominant

nataly862011 [7]

Answer:

The brown eyed trait is dominant

Explanation:

This question involves a single gene coding for eye color in humans. The alleles responsible for these traits in the gene are brown alleles (B) and blue allele (b). However, according to this question, two brown eyed parents give birth to a blue eye baby.

The dominant trait is the BROWN-EYES, however, the two brown-eyed parent gave birth to a blue eyed child because the two parents were heterozygous for the trait i.e. contained one brown allele and one blue allele in their respective gene (Bb). Hence, if these two cross, 3/4 of the children will possess the dominant trait (brown eyes) while 1/4 will possess the recessive trait (blue eyes).

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