For question 1, the option is C. Though I don’t know what the answer for option 2 is.
The spinal fluid is actually called cerebrospinal fluid(CSF). It's job is to pretty much protect the brain and spine. It also soaks them in nutrients and gets rid of waste products from the spine and brain.
Answer:
a)The Moon passes between the Sun and Earth.
Explanation:
Sometimes when the moon orbits Earth, it moves between the sun and Earth. When this happens, the moon blocks the light of the sun from reaching Earth. This causes an eclipse of the sun.
If an organism changes during life in order to adapt to its environment, those changes are passed on to its offspring.