Answer:
Level 4
Explanation:
Level 1 is an individual, Level 2 is a population, Level 3 is a community, and Level 4 is an ecosystem.
Answer:
False
Explanation:
A heart arrhythmia is an irregular heartbeat.
The classroom app or an online school :P Right..?
I'm pretty certain that it's a or b. C and D would be something that a surgean would wonder. Although, im most certain that it's B. Scientists are always asking how or about the causes of something