Temperatures on earth remain within a suitable range for life because of the

1 answer:

5 0

Two main factors :
First, the distance from the earth to the sun allows enough heat (energy), not too much, to be absorbed on earth's surface.
Second, earth's atmosphere allows it to keep most of the heat it absorbed during the day for the night. Otherwise, temperatures would drop down below a life sustaining point.

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Bruce Wallace (1963) established a laboratory population in which the recessive allele lt was at a frequency of 0.5. He propagat

Alenkinab [10]

Answer:

a. True

Explanation:

Bruce Wallace was a professor emeritus of genetics who performed many population studies. He worked in 1958 at the University of Cornell as a professor of genetics. In 1963, he performed a population study wherein the recessive allele It was at a frequency of 0.5. The population was propagated for 10 generations and the frequency of It for each generation was determined.

The result of this study showed that lt/lt died without reproducing, whereas, individuals with genotype +/+ were normal.

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3 years ago

Paul had chicken pox when he was 5 years old. nicholas received the chicken pox vaccines. which type of immunity does each man h

GrogVix [38]

Answer:

Paul has natural active immunity, while Nicholas has artificial active immunity.

Explanation:

Natural active immunity is an immunity that occurs when an individual is exposed to a disease causing organism, gets infected, and also become immune to the disease due to the primary immune response. From the question, Paul has natural active immunity because he had chicken pox before, and the virus that causes chicken pox has interacted with his immune response, hence, making him to develop natural immunity to the disease.

Artificial active immunity is an immunity that an individual acquires when small amount of immunity to a disease is deliberately exposed to his body. Artificial active immunity is usually produced in the form of vaccinations. From the question, Nicholas has artificial active immunity because chicken pox vaccines were intentionally introduced to his body.

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2 years ago

In ______ reproduction, genetically identical offspring are produced, while in ______ reproduction, offspring are genetically di

xxTIMURxx [149]

In asexual reproduction, genetically identical offspring are produced, while in sexual reproduction, offspring are genetically different from each other.

Sexual reproduction is a sort of reproduction that involves a complex existence cycle wherein a gamete (inclusive of a sperm or egg mobile) with an unmarried set of chromosomes (haploid) combines with another to provide a zygote that develops into an organism composed of cells with two sets of chromosomes (diploid).

Sexual reproduction is the maximum common existence cycle in multicellular eukaryotes, which includes animals, fungi, and plants.

Asexual reproduction is a sort of reproduction that doesn't involve the fusion of gametes or change in the number of chromosomes. The offspring that get up by asexual reproduction from both unicellular and multicellular organisms inherit the whole set of genes in their single parent. Asexual reproduction is the number one shape of reproduction for single-celled organisms including archaea and bacteria.

Learn more about Sexual reproduction here: brainly.com/question/815744

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1 year ago

Pollen can be used as an indicator of past climates and vegetation. give two reasons why pollen is well suited to this use:

almond37 [142]

Answer:

A.) Pollen are well preserved in the sediment layers because they are highly resistant to decay.

B.) Other indicators that can be used to determine past climates are through the analysis of the width of tree rings and the coral reefs formed underwater.

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3 years ago

Why is sporophyete referred as semi parasite

Vera_Pavlovna [14]

It is because the moss sporophyte have specialized pores which is called the "stomata." It also supports photosynthesis because it allows the carbon dioxide and oxygen between outside air and sporophyte inside.

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