It's very likely that the catcus with short spines will die out faster than the cactus with long spines.
For the first blank it would be: Lock
&
For the second blank it would be: Key
Answer:
Bromine (Br)
Explanation:
Bromine (Br) is the 35th element in the periodic table. Its atomic weight is 79.9 daltons. Elemental bromine exists as a diatomic form (Br 2).