Which of these factors could cause an ecosystem to become unstable? A
A change occurs that threatens keystone species.
B
Populations of invasive species rises while native species decreases.
C
Large predators in the ecosystem become extinct.
D
All of the above

What type of reaction is shown below? check all that apply. 2h2o2 → 2h2o + o2 synthesis decomposition combustion

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .