What effect would a red sky and/or sun have on plants and animals?

If an Earth-like planet had an older, red sun "” or maybe just a reddish sky due to some property of the atmosphere "” how would that affect the growth and/or adaptation of plant and animal life on the planet? Would plants still be green? Would the darker sky affect the eyesight of animals?

Please describe any notable differences in flora/fauna between Earth and a comparable planet with a red sky. For the topic of this discussion, assume all other properties of the planet are similar or identical to those of Earth.

In case it's important, I'm building an alien world with a red sky and mountainous, spiky terrain. Note that I'm not looking for a list-format answer, but rather a description (and explanation) of the differences I should implement when designing the organisms on the planet.

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What effect would a red sky and/or sun have on plants and animals?

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