Question

2 what makes one animal less adapted than another?
it has a shorter lifespan than others of its species.
it is smaller and less brightly colored than others.
its phenotype is less suited to its environment.
it has failed to adapt to its habitat during its lifetime.

Explanation:

In evolutionary biology, adaptation refers to how well an organism's phenotype (observable traits) fits its environment. A shorter lifespan or size/color differences don't directly define less - adaptation unless related to environmental fit. Also, adaptation in evolution is a population - level, generational process, not an individual's lifetime change. So, the key is phenotypic suitability to the environment.

Answer:

Its phenotype is less suited to its environment.