Answer: first 2 statements ie. It is essential that our diet provides these amino acids.
There are 20 essential amino acids.
If a person built a bridge that didn’t have water holes under it than the other side of the river would drought and kill all animals depending on that sorce of water
Answer: Viruses, although not living things, do show some characteristics that they are living. Because they can't reproduce by themselves (without a host), viruses are not considered living. They are made of proteins and glycoproteins like cells are. They contain genetic information needed to produce more viruses in the form of DNA or RNA.
They are acellular, that is, they contain no cytoplasm or cellular organelles. They carry out no metabolism on their own and must replicate using the host cell's metabolic machinery.
Its a sex linked disorder and it makes stopping the bleeding slower in affected individuals.
<h3><u>Explanation:</u></h3>
Hemophilia is a sex linked recessive disorder which occurs due to a gene present in the X chromosome. The presence of this gene in males surely make the individual hemophilic because the Y chromosome doesn't contain any dominant factor of this gene. In females, the recessive individuals become carriers without expression of this gene. Only the dominant individuals in females expresses Hemophilia.
Its a disease where the Christmas factor (Factor IX) or the antihemophilic factor(Factor VIII) is absent in the affected individual. This makes the cascade theory incomplete and there's a defect in blood clotting in both the intrinsic and extrinsic pathways. Thus the persons if starts bleeding, loses a lot of blood before coming to a stability.
Communities exist within populations which exist within ecosystems is the false statement and is denoted as option B.
<h3>What is a Population?</h3>
This refers to the number of people who are present in an area within a given period of time.
Populations are within a community and communities are found within ecosystems which is why option B was chosen.
Read more about Population here brainly.com/question/25630111
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