BIOLOGY HIGH SCHOOL

Human impact on ecosystems would most likely lead to secondary succession over primary succession.Please select the best answer from the choices provided
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Answers

Answer 1
Answer:

Answer:

The given statement is true.

Secondary succession refers to the series of community changes that take place on previously established but damaged or disturbed habitat.

It helps in reviving or re-establishment of the similar ecosystem that previously existed.

It starts by a disturbing event such as natural disaster (hurricane, tornado, earthquake et cetera) and human interventions (deforestation, accidental forest fires caused by human activities, habitat destruction due to mining or dam construction et cetera) which greatly reduce the ecosystem already established.


Answer 2
Answer: The Statement would be true stated by the definition

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A client's blood pressure drops from 120/76 to 90/60 mm Hg as soon as positive end-expiratory pressure (PEEP) is initiated for the treatment of hypoxemia. What is the most likely cause of this decrease in blood pressure?

Answers

Answer:

Decrease in cardiac output

Explanation:

Blood pressure may be defined as the pressure exerts by the artery on the walls during the blood flow. The systolic pressure is used for the calculation of the blood pressure.

The blood pressure depends upon the cardiac output, heart beats and rate of the blood flow. The cardiac output is the volume of blood pumped in the body per minute. The decrease in the cardiac output will ultimately results in the decrease in the blood pressure.

Thus, the correct answer is decrease in cardiac output.

We are able to learn all of the following from fossils EXCEPThow living things change over time
bone structure of an organism
the type of hair animals had
the type of teeth an animal had

Answers

you can't learn the type of hair creatures had in fossils as hair is very hard to fossilize because what makes things fossilize is after it gets old enough a layer of hard rock will eventually turn into a fossilized object. anything can fossilize as long as it is physically strong enough to withstand 1,000 years of age.

How do adrenaline help in dealing with emergency situations

Answers

Adrenaline helps in emergency situation by providing energy so that the major muscles of the body can respond to the perceived threat.
In danger, the brain then sends nerve impulses to the adrenal gland in the kidneys. When the nerve signal reaches the adrenal gland, chromaffin cells, in the medulla of the adrenal gland, release epinephrine or adrenaline. It then enters the bloodstream. It is thus carried around the body to cells in various locations, where it initiates several responses.
1. Adrenaline, along with another hormone called glucagon, is responsible for the breakdown of glycogen in liver cells. Glycogen is a form of energy storage. This gives energy to the muscles
2. Adrenaline effects the skin also. Restriction of the arteries is caused by the binding of epinephrine/adrenaline to some alpha-adrenergic receptors. This cuts off blood supply to the skin. This results in the contraction of the smooth muscle cells in the skin, which cause the raising of the hairs on the surface of the skin. 
3. The lungs contain smooth muscle. Epinephrine causes smooth muscles to relax. Specifically, epinephrine binds to beta-2-adrenergic receptors on bronchiole muscle cells. This allows the bronchioles to relax, which enables intensified respiration.
4. Adrenaline binds to beta-adrenergic receptors on heart muscle cells. This causes the contraction rate of the heart to increase. This ultimately leads to increased blood supply to the tissues in the body.

Parasitic bacteria that depend on eukaryotic host cells are A. protozoa.
B. rickettsia.
C. fungi.
D. viruses.

Answers

They are rickettsia.

I NEED AN ANSWER RIGHT NOW!!!!!!!!!!What is an advantage of using cell culture rather than bacterial culture to produce biological molecules?

A]Cell culture can be used to produce fat-soluble vitamins.
B]Cell culture can be used to produce steroid hormones.
C]Cell culture can be used to produce clones.
D]Cell culture can be used to produce complex proteins.

Answers

The answer is Cell culture can be used to produce complex proteins.
so the answer is D
Hi There! :)

I NEED AN ANSWER RIGHT NOW!!!!!!!!!!What is an advantage of using cell culture rather than bacterial culture to produce biological molecules?

A]Cell culture can be used to produce fat-soluble vitamins.
B]Cell culture can be used to produce steroid hormones.
C]Cell culture can be used to produce clones.
D]Cell culture can be used to produce complex proteins.

D]Cell culture can be used to produce complex proteins.

Favorable changes in species get passed down through the generations because of

Answers

Answer:

Natural selection

Explanation:

Natural selection favors the individuals carrying the adaptive variations and allows them to reproduce more as their beneficial variations impart them the survival advantage. These individuals with beneficial adaptive traits reproduce more and produce a large number of progeny, all carrying the useful adaptive features of the parents.  

Hence, natural selection favors individuals with beneficial variations. The differential rate of reproduction of the favored individuals allows inheritance of favored variations to the future generations.  
That process is called natural selection
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