Under the missouri compromise of 1820:
a. slave states gained a two-seat advantage in the u. s. senate.
b. missouri agreed to gradual emancipation of slavery in exchange for admission to the union.
c. ohio became a free state to balance the admission of missouri as a slave state.
d. the remaining louisiana purchase territory was divided into slave and free zones.
e. congress banned slavery in any new territory that might ever be added to the united states./search?

Option (D) is correct.

Explanation:

Missouri Compromise of 1820 is referred as the legislation which provided for Maine admission to US as a free state alongside Missouri as a slave state, therefore maintaining the equilibrium of authority between North and South in US Senate. The 16th US Congress passed this legislation on 3rd March 1820, and the President at that time James Monroe ratified it on 6th March, 1820.

the part of the earth that is best reflected on a map is the surface. maps reflect borders of countries or territories as well as physical features like mountains.

explanation:

the invasive species was introduced due to commercial purpouses, as there was a demand for fur clothes and hence, a business opportunity connected to this product. actually, it was when the nutrias scaped, causing harm to the us ecosystems when they acquired the status of invasive species. in this case they have caused an environmental problem, but it could have affected also economic interests or even human health.