What is a possible cause for a decrease in ecosystem productivity?

a.

an increase in the biodiversity of the ecosystem

b.

a decrease of the biodiversity of an ecosystem

c.

the biodiversity of an ecosystem experiencing no change

d.

an ecosystem becoming more stable

B.)a decrease of the biodiversity of an ecosystem

Explanation:

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abraham lincoln was the president of usa and he had asked the audience to make a pledge on equality.

his pledge was:

“it is my earnest desire to know the will of the providence.”

lincoln also had hatred for people who condoned and practiced slavery and so he pledged:

""and if i can learnt what it is i can do it"" this is another pledge by abraham to reassure the congregation on how to deal with the providence will.

explanation:

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b - those executed came from every social and economic class