How has earth change during our current era?

the climate has cooled and became less humid

hope this

explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)

answer; /// the amount of material dissolved in a measure of liquid(concentration) the above statement is (true); /// good luck