Answer:
The main factor that slowed construction of the Central Pacific railroad was. a shortage of supplies, which had to be shipped around South America. intense summer heat that melted the railroad ties and tracks.
Explanation:
A substance produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction.
<span>Lack of technology to use them caused the cold war leaders to hesitate to use nuclear weapons.
</span><span>B. Lack of technology to use them </span>
