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adoni [48]
4 years ago
15

All of the following are TRUE regarding the fight-or-flight reaction, EXCEPTA.it is a relatively new human adaptation.B.it enabl

es our bodies to prepare quickly escape from an injury.C.it prepares our bodies to engage in a physical battle.D.it enables our bodies to prepare quickly escape from an injury and prepares ourbodies to engage in a physical battle
Biology
1 answer:
Assoli18 [71]4 years ago
8 0

Answer: A.it is a relatively new human adaptation.

Explanation:

Fight or flight response is a response shown by a human or animal body towards acute stress. It is a physiological reaction that occurs in response to the perceived attack, survival threat and attack. The animals or humans react to threats by the hormonal secretion from sympathetic nervous system. This prepared animals for fighting. The hormonal secretions like catecholamines, epinephrine and nonepinephrine helps in generation of response. Neurotransmitters dopamine, estrogen, testosteron e and cortisol affects how organisms react to the stress.

Fight-or-flight reaction is not a relatively new human adaptation but it is evolved as a survival mechanism which was also present in primitive human beings and mammals and helped them to react in the life-threatening situations.

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What is used as evidence to develop a phylogenetic tree?
alexira [117]

A phylogenetic tree is the representation of the evolutionary relationships among species. The fossil records are used as evidence to develop a phylogenetic tree. Thus, option A is correct.

<h3>What is a fossil record?</h3>

A fossil record is a depiction of the organisms that shared common ancestors and depicts the change in the structural and functional unit of the organism over many years of time.

They are used to illustrate the phylogenetic tree to show the morphological, structural, chemical, anatomical, etc variations in species that shared ancestry.

Therefore, option A. fossil records are used to show the common ancestry at the nodes.

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7 0
1 year ago
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The reaction mixture for PCR is missing the enzyme Taq polymerase. Which step of PCR would this affect?
djyliett [7]

Answer:

The missing of Taq DNA polymerase will affect the DNA synthesis or polymerization step.

Explanation:

Taq DNA polymerase is also known as termostable DNA polymerase because it is able to exert its catalytic activity at high temperature.

     Taq DNA polymerase is used for the 3rd step of polymerase chain reaction which deals with the joining of nucleotides by phosphodiester bond formation.

     The missing or lack of Taq DNA polymerase will affect the DNA synthesis step of PCR.

8 0
3 years ago
All of the following are probable ways to de-escalate conflict between groups except Please select the best answer from the choi
aleksandrvk [35]

Answer:  reducing all communication after conflict occurs ​

Explanation:

5 0
3 years ago
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How do the data relate to selective pressure and natural selection?​
vekshin1

pls mark as brainlist

Explanation:

Selection pressure means factors that contribute to selection which variations will provide the individual with an increase chance of surviving over others. Because of selective pressures, organisms with certain phenotypes have an advantage when it comes to survival and reproduction. Over time, this leads to evolution.

7 0
3 years ago
Fill in the blanks.
Zigmanuir [339]

The youngest layer present on the top whereas the oldest layer is present at the bottom.

<h3>Which layer is youngest or oldest?</h3>

Quartz or calcite lines in layers of rock indicate that rock has minerals.

The youngest rock layers are present on the upper while on the other hand, the oldest are present on the bottom side because new layers are formed when there more sediments deposited on the layer.

So we can conclude that the youngest layer present on the top whereas the oldest layer is present at the bottom.

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7 0
2 years ago
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