Which layer of the hair is effected by ph is it a. cortex b. medulla or c. cuticle

How can you keep track of variables in a science experiment?

Ascientist discovers a new body between the orbit of neptune and the kuiper belt. the object is round and travels in an orbit around neptune with other space objects. the scientist claims that she has found a new dwarf planet. where is the scientist’s error?

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?