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shusha [124]
2 years ago
6

The diagram shows the bone structure of the front legs of two animals: a frog (amphibian) and an alligator (reptile). Shading is

used to identify similar bones.
How does a comparison of the bone structures of the two animals provide evidence of an evolutionary relationship?

A.
The analogous structures are evidence that one animal evolved from the other.

B.
The homologous structures are evidence of descent with modification from a common ancestor.

C.
The homologous structures are evidence that one animal evolved from the other.

D.
The analogous structures are evidence that the two animals do not share a recent common ancestor.
Biology
1 answer:
velikii [3]2 years ago
5 0

Answer:

The correct option is B) The homologous structures are evidence of descent with modification from a common ancestor.

Explanation:

Homologous structures can be defined as similarities between organs or skeletal of organisms which suggest that they might have a common ancestor in the past. Homologous structures will have alike structures although they may be present in animals of different texa.

For example, The front legs of a frog, which is an amphibian is similar to alligator which is a reptile. This common structure show that they have homologous structures and hence might have had a common ancestor in the past.  

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Which of the Earth’s subsystems is directly affected by burning fossil fuels?
gulaghasi [49]

The correct answer is option (d) atmosphere.

Fossil fuels are the hydrocarbons formed in the geological past, derived from the remains of dead plants and animals. They include the coal, fuel gas and the natural gas. The burning of fossil fuels is one of the greatest contributor of carbon dioxide being added to the atmosphere. This results in the pollution of air in the atmosphere resulting in the formation of smog. Carbon dioxide being a green house gas, affects the atmosphere and causes green house effect leading to global warming and climate changes.

The burning of fossil fuels affects the geosphere, biosphere and hydrosphere indirectly due to its primary direct effect on the atmosphere. Thus, atmosphere is directly affected by the burning of fossil fuels.

5 0
2 years ago
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Calix’s karyotype showed that he has a genotype of XXY. Explain how nondisjunction caused Calix to be XXY.
Juli2301 [7.4K]

Answer:

A XY or XY gamete fuses with a normal gamete (X or Y)

Explanation:

Meiotic nondisjunction is the phenomenon whereby chromosomes fail to separate during meiosis I or II. Meiotic nondisjunction leads to the formation of abnormal gametes I.e. gametes with additional or missing chromosomal piece.

The fusion of these abnormal gametes produced by nondisijuction with a normal gamete (X or Y chromosome). This leads to a condition called ANEUPLOIDY, which is a chromosomal disorder. In the case od Calix, XXY is an ANEUPLOIDY state that could have resulted because there was a fusion between a XX gamete and Y gamete or XY and X. The XY or XX gametes are produced as a result of nondisijuction.

4 0
2 years ago
HELP ME FAST PLEASE!!!!
SVETLANKA909090 [29]
Think it’s answer D but it maybe B
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6 0
1 year ago
A provider is performing an experimental cervical sympathectomy on a patient with raynaud's syndrome. what cpt® and icd-10-cm co
SOVA2 [1]
The CPT code for sympathectomy (since this patient will undergo an experimental cervical sympathectomy) is <span>CPT 64802, Under Excision Procedures on the Sympathetic Nerves. The ICD-10-CM code for Raynaud's syndrome is 443.0.</span>
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2 years ago
To cause cancer, tumor suppressor genes require __________ allele(s) to be mutated and therefore are considered ________________
Dafna11 [192]

Answer:

Two

Recessive

Loss

Explanation:

To cause cancer, tumor suppressor genes require two alleles to be mutated and therefore are considered recessive. The mutation results in a loss of function.

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2 years ago
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