Answer:
3)The epiglottis is a small, movable "lid" just above the larynx that prevents food and drink from entering your windpipe. But if the epiglottis becomes swollen — either from infection or from injury — the airway narrows and may become completely blocked.
4)Your stomach lining also secretes hydrochloric acid, which creates the ideal conditions for the protein-digesting enzymes to work. The potent hydrochloric acid kills bacteria, protecting your body from harmful microbes which can enter your body in food.
5)Made up of three segments -- the duodenum, jejunum, and ileum -- the small intestine is a 22-foot long muscular tube that breaks down food using enzymes released by the pancreas and bile from the liver.
Explanation:
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Based on the genetic variation, it is true that natural selection does not always produce perfectly working adaptations, because it can only work on the genetic variation present in a population.
What is natural selection?
Natural selection is the process by which species which are better adapted to an environment survive over those not suited to the environment.
Does natural selection produce perfect adaptations?
Natural selection do not produce perfect adaptations because:
- Adaptations are often compromises.
- Organisms are locked into historical constraints.
- Selection can only edit variations that exist in a present population.
Therefore, it is true that natural selection does not always produce perfectly working adaptations, because it can only work on the genetic variation present in a population.
Learn more about natural selection at: brainly.com/question/23929271
And water vapor get into the atmosphere from plants by a process called transpiration. As the water vapor rises in the atmosphere it cools, forming tiny water droplets high in the sky by a process called condensation. Those water droplets make up clouds.
The polar bears are going to fight for the different resources that will become limited in their environment
If she can touch her toes without bending her knees