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Wittaler [7]
3 years ago
9

What causes a star to shine brightly?

Biology
2 answers:
bogdanovich [222]3 years ago
5 0

Answer:

d

Explanation:

Neporo4naja [7]3 years ago
4 0
The types of elements that are present
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Blood pressure falls with distance from the heart. Using this information, which of the following properly lists the type of blo
Angelina_Jolie [31]

Answer:

The correct answer will be- arteries→capillaries→veins

Explanation:

The circulation of blood in the closed circulatory system flows through blood vessels. These blood vessels show structural differences in response to the pressure exerted by the blood on the surrounding medium.

The blood pressure varies in the circulatory system because the heart pumps the blood with a greater force, so the blood vessel called arteries which carries the blood from the heart posses thicker walls.

The blood pressure reduces until the blood reaches the organs, the blood pressure reduces. Thus the blood in the capillaries has lower pressure.

When blood exits from the organs back to the heart, then the blood pressure is highly reduced as a result, the veins carry the blood with lower pressure.

Thus, arteries→capillaries→veins are the correct answer.

4 0
3 years ago
A wolf's diploid number of chromosomes is 78. How would the number of chromosomes in the wolf's body cells compare to the number
dimulka [17.4K]

Answer: The number of chromosomes in the wolf's body cells is 78 while the gametes has 39

Explanation:

Since each body cell under only mitosis to yield two daughter cells with equal number of chromosome as the parent cell (i.e diploid number, 2n) while sex cells undergo meiosis to yield four daughter cells with half the number of chromosomes as the parent cell (i.e haploid number, n); thus, the wolf's body cells has 78 chromosomes while the gametes has 39 chromosomes.

7 0
3 years ago
Which molocule is used to cut out a section of dna
pshichka [43]

Answer:

Restriction enzymes (endonucleases) are used to cut the DNA into fragements.

Explanation

Restriction enzymes are obatained from bacteria where they are utilized by bacteria for protection against viruses. Restriction enzymes are used in biotechnology research. There are several restriction enzymes and each cut the DNA at specific site known as recognition site which is usually 4-8 neucleotide long. They produce sticky ends (cutting the both DNA strand on different site) and blunt ends (cutting the both DNA strand on same site) on DNA fragments.

7 0
3 years ago
Why are differences and similarities in DNA and proteins evidence of evolution?
olga55 [171]

Answer:

Homologous structures provide evidence for common ancestry analogous structures show that similar selective pressures can produce similar adaptations beneficial features Similarities and differences among biological molecules in the DNA sequence of genes can be used to determine species relatedness

6 0
3 years ago
Infants require many nutrients early in life, including lipids such as fats. A low-fat diet for infants is not recommended becau
zloy xaker [14]

Answer:

Lipid intake through diet is important for the infants as it helps in growth, development.Brain, retina and nerve tissues contain long chain PUFA(Poly unsaturated fatty acid) that is provided through the intake of lipids.

Explanation:

Dietary lipid is traditionally be consider as an important and essential nutrient for the infants as they provide many function in the body of infants They helps for proper growth and development of the infant.Thus selection of dietary lipid is important.Brain, and other neural tissue contain long chain poly unsaturated fatty acid that are important for producing eicosanoid. They are powerful mediators as they helps in different functions that are performed by cells and tissues.More over fat provide energy that are required for doing various physiological activities.

4 0
2 years ago
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