Which type of photoreceptor cells demonstrate extensive neural convergence resulting in spatial summation, useful for low light vision

4.a depression is the answer

Ithink the answer is b : )

It developed as a reaction to the impact of european colonialism in africa on peoples of african descent. in the  mid-20th century, activists in africa adopted pan-africanism as a rallying cry for independence from colonial rule. some african pan-africanists sought to unite the continent as one independenthope it was useful