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3 years ago

How does the geographic distribution of organisms support the theory of evolution?

Biology

1 answer:

RUDIKE [14]3 years ago

4 0

Organisms on a island are more similar to those on a nearby land mass than to those in similar climates further away.

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In angiosperms, xylem consists of tracheids and

svlad2 [7]

hi there

your answer to this is : C) vessel elements

EXPLATION:

The most distinctive xylem cells are the long treachery elements that transport water. Tracheids and vessel elements are distinguished by their shape; vessel elements are shorter, and are connected together into long tubes that are called vessels. Xylem also contains two other cell types: parenchyma and fibers.

i hope this helped you out

have a great afternoon

FaithRawlins14

6 0

3 years ago

1. A couple of mice with brown fur and black eyes had litter with the following distribution of traits: 9 with brown fur and bla

Ierofanga [76]

Answer:

The genotype of the couple of mice is heterozygous.

Explanation:

First, we going to classify each trait as dominant or recessive allele:

Brown fur: It’s a dominant allele because 12 of 16 mice have brown fur, therefore 75% of the litter have this trait.

Black eyes: It’s a dominant allele because 12 of 16 mice have black eyes, therefore 75% of the litter have this attribute.

Grey fur: It’s a recessive allele because only 4 of 16 mice have this trait, so 25% of the litter have grey fur.

Red eyes: It’s a recessive allele because 4 of 16 mice have red eyes, so 25% of the litter show this trait.

Second, we going to name each phenotype with a letter and use a capital letter for dominant allele or a small letter for recessive allele.

For the color of the fur, let’s use letter “F”:

F: Brown fur

f: Grey fur

For the color of the eyes, let’s use letter “E”:

E: Black eyes

e: Red eyes

The genotype of each phenotype is conformed by two letters that indicates, the recessive allele is showed in the phenotype only when both letters in the genotype are small letter.

For example, for fur, there are three combinations:

FF: Brown fur (two dominant alleles)

Ff: Brown fur (A dominant allele and a recessive allele)

ff: Grey fur (Two recessive alleles)

For eyes, there are also three combinations:

EE: Black eyes (two dominant alleles) (

Ee: Black eyes (A dominant allele and a recessive allele)

ee: Red eyes (Two recessive alleles)

When both allele of the genotype are dominant or recessive, it is heterozygous, if there are a dominant allele and a recessive one, it is a homozygous.

Since there are 7 mice that show recessive phenotype, that means the genotype of the couple of mice are heterozygous. Although, both mice show a dominant phenotype, the genotype have a dominant allele and a recessive allele.

The genotype for the couple of mice is:

FfEe x FfEe

So, when we apply the Mendel's third law, we got the results showed in the chart.

5 0

3 years ago

The ancient Egyptians used the stars to _____.

Savatey [412]

The ancient Egyptians used the stars to tell when a flood was going to happen. Every summer a flood would happen but this also happened when the bright star Sirius rose before the sun.

Hope that helped ^^

7 0

3 years ago

Which of the following is not a negative consequence of upward urban growth?

Volgvan

Answer: I believe its C

Explanation:

5 0

3 years ago

In its role as an antioxidant, _____ guards cell membranes, body proteins, dna, and cholesterol, and thus helps prevent heart di

vodka [1.7K]

Answer:

The answer is Vitamin E or α-tocopherol.

Explanation:

Vitamin E is a fat-soluble vitamin is first absorbed in the small intestine and is then stored at the liver. It is an antioxidant which protects cells from free radicals or reactive oxygen species (ROS). It can also prevent bad cholesterol from depositing in the blood vessels.

Vitamin E can be naturally found in nuts, seeds, and vegetable oils. As a dietary supplement, it takes the form of α-tocopherol. The RDA depends on the age of the person, as it may range from 4 mg to 15 mg per day.

Vitamin E deficiency is so rare that it will only occur if the person has a fat malabsorption illness like Crohn's disease, abetalipoproteinemia, etc. Symptoms of deficiency include muscle weakness, retinal degradation, peripheral neuropathy, and an immunocompromised state.

7 0

3 years ago