Which of the following is a substance?

A) smoke
B) salt
C) granite
D) brass

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

How many autosomes are in this human karyotype? how many sex chromosomes?

Define adaptation. why do organisms adapt? give an example.