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Oksi-84 [34.3K]
2 years ago
8

In parts of the United States Midwest, you can find fossils of ancient sea creatures. Some of these fossils could easily be mist

aken for the remains of current day sea creatures, although they are only very distantly related. The ancient fossils are a record of when shallow seas covered much of the United States. While the fossils are of organisms that are the precursors of many modern day organisms, changes in ocean geography and other factors eventually caused those older species to become __________. A) adapted B) evolved C) extinct D) obsolete
Biology
1 answer:
Naya [18.7K]2 years ago
8 0
The answer to this is C. The ancient fossils are a record of when shallow seas covered much of the united states. While the fossils are of organisms that are the precursors of many modern day organisms, changes in ocean geography and other factors eventually caused those older species to become extinct.
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History: When did stem cell research become known? Who discovered stem cells? What experiments or studies have been conducted so
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Answer:

The stem cells was discovered by Ernest McCulloch and James Till in 1981. Studies conducted for stem cells can be used for bone marrow transplantation and to treat various diseases.

Explanation:

Stem cell are the cells that has the ability to differentiate into different cells of the body. In 1978 human cord blood discovered as stem cell. The stem cell research come to known in 1981.

Ernest McCulloch and James Till discovered the stem cell research while working on the mice bone marrow. He found that the different blood cells were formed by the single class of cells.

Experiments on mice and other animals have been conducted to study the stem cells so far. The study of stem cell is useful to cure the genetic defects, Cancer and other harmful diseases.

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3 years ago
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Jamie is still mad and he doesn't understand Vicky's explanation. He says "You aren't even speaking English! What are heterozygo
lord [1]

Explanation:

The term Heterozygous and the recessive alleles are used in the Genetics to refer to the allele conditions present in an organism. The trait of an organism is controlled by the genes which are present in its alternative form on the chromatids at a position called locus.

Recessive alleles

A trait is expressed when each parent contributes one allele and when these two alleles come in complementary position express its effect. The alleles which express its highest effect on a trait is called dominant allele and the other allele which is not able to show its effect or is suppressed is called the recessive allele.

Heterozygous parents

In such condition, when an organism has one dominant and one recessive allele is known as a heterozygous organism and if the allele pair has either both dominant or both recessive alleles are homozygous organisms.

6 0
3 years ago
Type the correct answer in each box
ella [17]

Answer:

- 24 carbon atoms, 48 hydrogen atoms, and 24 oxygen atoms

Explanation:

Glucose is a simple carbohydrate and a compound that is made of the elements carbon, hydrogen, and oxygen.

One molecule of glucose contains six carbon atoms, 12 hydrogen atoms, and six oxygen atoms.

Therefore, four molecules of glucose will have 24 carbon atoms, 48 hydrogen atoms, and 24 oxygen atoms.

That is; 4(C₆H₁₂O₆), thus, C = 4×6 =24, H = 4×12 =48, and O = 4×6 =24.

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3 years ago
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