If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content
AP Bio: SYI‑1 (EU), SYI‑1.G (LO), SYI‑1.G.1 (EK), SYI‑1.H (LO), SYI‑1.H.1 (EK), SYI‑1.H.2 (EK)
What factors limit population sizes?
Sort by:
Biology is brought to you with support from the Amgen Foundation