10 points and brainliest!
word bank:
acid, atomic number, base, buffer, chemical bond, chemical reaction, covalent bond, crystalline, hydrophilic, hydrophobic, ionic bond, isotope, matter, neutron, ph, physical property, polar molecule, proton, radical, radioactive

a(n) substance has a regularly repeating arrangement of atoms.

Crystals are substances with a regular, repeating arrangement of atoms. You can see this clearly in any image you get of any crystalline formation.

You can get this answer, either by knowledge or elimination. Some terms cannot even have atoms (atomic number, buffer, etc.), others aren't even substances (chemical bond, chemical reaction, covalent bond, pH) and yet others are so small atoms don't fit in them (proton, neutron).

Image description: Crystalline formation - differences with other formations.

Hope it helped,

BioTeacher101

enhanced global partnerships and exploration capabilities may advance international preparedness for protecting the earth from catastrophic events such as some asteroid strikes, advancing collaborative research on space weather and protecting spacecraft by developing new means for space debris removal.

correct answer is a. and d.