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jok3333 [9.3K]
3 years ago
11

Hi, can someone please help? Will mark brainliest!!!

Biology
1 answer:
Katena32 [7]3 years ago
8 0

Answer:

one of the number of alternative of the same genes occupying a given position, A species or ogasim that is that is dominant.

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In contrast to environmentalists' proposals to limit emissions of certain pollutants, the administration proposed calling for ma
sammy [17]

 

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7 0
3 years ago
Read 2 more answers
Thousands of years ago, giraffes with short necks were common within giraffe populations. Nearly all giraffe populations today h
LiRa [457]

<u>Full question:</u>

Thousands of years ago, giraffes with short necks were common within giraffe populations. Nearly all giraffe populations today have long necks. This difference could be due to

giraffes stretching their necks to keep their heads out of reach of predators

giraffes stretching their necks so they could reach food higher in the trees

a mutation in genetic material controlling neck size occurring in some skin cells of a giraffe

a mutation in genetic material controlling neck size occurring in the reproductive cells of a giraffe

<u>Answer:</u>

This difference could be due to:a mutation in genetic material controlling neck size occurring in the reproductive cells of a giraffe

<u>Explanation:</u>

The primary short-necked forms contained large, mutable populations. Following the selection pressure of desiccations and leaf deficiencies, those changes with longer necks and forelegs sustained and repeated preferentially. In this procedure, throughout generations, these large mammals have occurred, being acclimated to their unique environment .

Lamarckian theory illustrated giraffe neck metamorphosis by showing that consistent stretching gradually extended their necks, and that they then moved on these propitious longer necks to their offspring. Environment and other variations created the extirpation of the eurasian giraffids, but various African species endured.

8 0
3 years ago
2 possible uses of genetic engineering
Jlenok [28]
Genetic engineering is the process of manipulating the genes and therfor the traits of an organism

we already genetically engineer our plants so they are stonger, faster, and produce better (better looking, better tasting, etc) fruit/food.

we might possible be able to genetically engineer humand or babies to controll the traits we want  (do you want your baby to be good at this)

basically genetic engineering is normally used to change theh current state of something so that it is more suited for the job that you intend for it

6 0
3 years ago
Read 2 more answers
During a meal, the __________ nervous system stimulates digestive activity and slows heart rate. during exercise, the __________
Licemer1 [7]

Answer:

During a meal, the parasympathetic nervous system stimulates digestive activity and slows heart rate. During exercise, the sympathetic nervous system inhibits digestion and increases heart rate.

<h2>What roles do the sympathetic and parasympathetic nervous systems play in the performance of an individual?</h2>

The two components of the autonomic nervous system are the sympathetic and parasympathetic nervous systems.

They are not in our control and acting against their will. The activities of the heart, lungs, digestive system, urinary system, perspiration, salivation, and sexual function are all under their control.

The thoracic and lumbar spine cords are the genesis of the sympathetic nervous system.

(Lumbar outflow from the thorax)

The cranial nerves of the brain and the sacral region of the spinal cord give rise to the parasympathetic nervous system.

The cranio-sacral outflow

On the effectors that they act on, they have opposing effects. The overall overview of how they work is as follows:

  • The sympathetic nervous system is what causes the "fight, flight, or fear" response. It often activates in emergency circumstances, and action is taken right away. It is heavily weighted toward the body's emergency and survival reactions to a dangerous stimuli. During sympathetic stimulation, there occurs dilation of the pupils, a rise in heart rate, dilation of the bronchi, dilation of the sweat glands, etc. It is accountable for both the retention phase of pee in the bladder and the erection phase of sexual stimulation.
  • The parasympathetic nervous system is in charge of the "rest and digest" phase. It helps with digestion and the relaxation response and is primarily engaged during resting and pleasure moods. The pupils close, the pulse rate and breathing slow down, digestive juices start to secrete, and bowel movement is improved. It is in charge of ejaculation during sexual activity and aids in urination by contracting the bladder.

As a result, it is clear that the sympathetic and parasympathetic nervous systems are essential to human existence. Even while the autonomic system cannot be consciously controlled, some people who practice yoga and meditation have developed the skills necessary to gradually regulate some bodily processes, including heart rate, body temperature, and digestive processes.

7 0
1 year ago
• What are the three structures that all cells have in common?
marusya05 [52]

Answer:

All cells share four common components: (1) a plasma membrane, an outer covering that separates the cell’s interior from its surrounding environment; (2) cytoplasm, consisting of a jelly-like region within the cell in which other cellular components are found; (3) DNA, the genetic material of the cell; and (4) ribosomes, particles that synthesize proteins. However, prokaryotes differ from eukaryotic cells in several ways.

5 0
2 years ago
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