Your answer would be Electrons. Positive protons and negative Electrons need eachother to balance out.
C5H10
general formula of Alkenes -
CnH2n
Red and yellow bell pepper plant can reproduce with each other - Genetic diversity.
A park has 80 species of trees - species diversity.
There are many breeds of dogs - genetic diversity.
Five different bird species are at a bird feeder - species diversity.
I’m pretty sure the answer is D habitat destruction and soil erosion