(Q).
Q: What organs are the main organs of the urinary system? Read this paragraph and choose the correct option from the provided answers: The kidneys are the main organs of the urinary system. Choices: - spleen - prostate - gall bladder - kidneys A:
(A).
kidneys

(Q).
Q: Fermat's principle states that what will always take the path that takes the least amount of time? Read this paragraph and choose the correct option from the provided answers: Light is a wave of changing electric and magnetic fields. Light waves are caused by disturbances in an electromagnetic field, like the acceleration of charged particles (such as electrons). Light has a dual nature; at times, it acts like waves, while at other times it acts like particles, called photons . Light travels through space at the maximum speed allowed by the laws of physics, called the speed of light. Light has no mass, but it carries energy and momentum. Fermat's principle states that light will always take the path that takes the least amount of time (not distance). Choices: - sound - wind - electricity - light A:
(A).
light

(Q).
Q: What's the most common disorder from having an extra chromosome? Read this paragraph and choose the correct option from the provided answers: One common example of an extra-chromosome disorder is Down syndrome ( Figure below ). Children with Down syndrome are mentally disabled and also have physical deformities. Down syndrome occurs when a baby receives an extra chromosome 21 from one of his or her parents. Usually, a child will receive one chromosome 21 from the mother and one chromosome 21 from the father. In an individual with Down syndrome, however, there are three copies of chromosome 21 ( Figure below ). Therefore, Down syndrome is also known as Trisomy 21. These people have 47 total chromosomes. Choices: - Williams syndrome - Turner syndrome - cri-du-chat syndrome - down syndrome A:
(A).
down syndrome