Something in the environment that causes organisms to respond is called what

Something in the environment that causes organisms to respond is called stimulus.

Explanation : A stimulus is something that causes activity. That activity is called response.

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a: the sheep and waste material both release carbon into the atmosphere.

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.