Which condition most contribute to disease spreading in tenements in the early 1900s a. inadequate lighting b. lack of electricity c. lack of fire protection d. inadequate sanitation

The best answer among the choices provided by the question is the third choice "inadequate sanitation"

the answer is: must pay taxes on profits

since it is considered as a part of your income, profits from investments is eligible for tax payment.

the tax from your investment could be influenced by how long you decided to sell it. united states promotes keeping your investment for long term period. so, the tax rate for investments that you sell in less than one year is typically higher compared to investments that you sell in more than one year period.

the steam engine.

the locomotive.

the telephone.

the telegraph.

the internal combustion engine.

the rifle.

ironclad ships.

electricity/light bulb.