each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
What is the question your trying to have answered?
DEABFC in order, that’s the answer
<span>The correct answer is Hear. During the development of human offspring, the sense of "hearing" comes first before the sense of sight. </span>Sight is the least developed sense at birth. Babies <span>can detect sounds by the third trimester. So more or less, this send is already advance for him at birth.</span>