which statements are true? select all that apply.
a. an atom is the smallest complete part of an element.
b. an element is a pure substance made of one kind of atom.
c. the nucleus is the tiny center of an atom, and it contains protons and neutrons.
d. isotopes are atoms of the same element that contain the same number of neutrons but different numbers of protons.

Which of the following is not an effect of land substance

Which of the following statements is true? a. there is not enough food produced in the world to feed everyone. b. the biggest cause of hunger and malnutrition is the cost of getting food to people who need it most. c. most countries have enough arable land and resources to feed their own population and export a surplus d. malnourishment is only seen in a few countries with very limited food supplies.

What makes a personal exceptionality/non-exceptionality