Answer:
So that the answers will be fair and that the results will be accurate.
Explanation:
Hasan most likely has rickets
Rickets is a disease of children which is caused by vitamin D deficiency. Rickets softens and weakens bones in affected children. Symptoms of rickets include bowed legs, pain in the bones, stunted growth, trouble sleeping and muscle weakness. Rickets can lead to other health problems such as intellectual disability and muscle spasms.
Answer:
The biological concept of species states that if 2 organisms can interbreed and produce fertile offspring they belong to the same species.
Scientist could observe them under natural conditions and check if they can reproduce to produce fertile offspring.