Question

NEED ANSWERS BEFORE 11 PLEASE HELP OR IM GROUNDED FOR A MONTH!!!

Answer 1

1.one species benefits, while the other is neither helped nor harmed
2.The snake is a keystone species in the ecosystem
3.Biodiversity and ecosystem health will both decrease in the future
4.Skunks and toads have a predator-prey relationship
8.the surviving species preyed on the extinct species
9.It results from instinct. 
10. web spinning 
11.migrating for warmth
12.They are a keystone species 
13.As biodiversity increases, humans receive increased benefits
looks like you had the answers already