D) all species in a natural community contribute to the community's integrity.
Hope this helps :)
Ptolemy was an astronomer and mathematician. He believed that the Earth was the center of the Universe. The word for earth in Greek is geo, so we call this idea a "geocentric" theory.With the development of the heliocentric model by Nicolaus Copernicus in the 16th century, the Sun was believed to be the center of the Universe, with the planets (including Earth) and stars orbiting it.
Receptor cells themselves become less responsive to an unchanging stimulus and the receptors no longer send signals to the brain. movements that you don't consciously notice. microsaccades saccadic movements keep eyes from adapting to what they see. what involves detection of physical stimuli<span> from </span>environment<span>
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Gymnosperms have pollen but no flowers.
Answer:
a scientist collects deer feces
Explanation:
not directly observing the deer themselves