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.
Answer:
Endonucleases
Explanation:
<em>Endonucleases are involved in DNA repair. The repair can be a base-excision repair, nucleotide excision repair or mismatch repair.</em>
Endonucleases are of different types and the type that will involve in DNA repaid depends on the type of repair that is required. It include deoxyribonuclease I and restriction endonuclease/restriction enzymes. The former cleaves DNA without taking note of the nucleotide sequence while the later is specific in the sequence of nucleotides it cuts.
B. global warming has been going on for years
Answer:
resolution
Explanation:
The resolution of a microscope or lens is the smallest distance by which two points can be separated and still be distinguished as separate objects. The smaller this value, the higher the resolving power of the microscope and the better the clarity and detail of the image.
