Question

what is a limiting factor?
factors that keep a population limited to a certain number of individuals
factors that determine how many offspring an individual can have in a lifetime
factors that limit the reaction rate of photosynthesis in a given ecosystem
factors that limit how large an organism can grow

Explanation:

A limiting factor in ecology (a subfield of Biology, Natural Science) is a factor that restricts the growth, abundance, or distribution of a population. The first option, "factors that keep a population limited to a certain number of individuals", aligns with this definition. The second option is about an individual's offspring, not population limits. The third is about photosynthesis rate, not population. The fourth is about an organism's growth, not population size limits.

Answer:

factors that keep a population limited to a certain number of individuals