Answer:
Natural selection needs some starting material, and that starting material is heritable variation. For natural selection to act on a feature, there must already be variation (differences among individuals) for that feature. Also, the differences have to be heritable, determined by the organisms' genes.
Probably becauase stream pools are in motion.
External and internal cues trigger different genes to turn on and off in different cells
B. Herbivorous.
Hope this helped!:)
Based on the given statement above, the correct answer would be TRUE. It is true that naturalistic observation is commonly used for anthropology studies. In naturalistic observation, this is when the r<span>esearcher makes observations in a particular natural setting (the field) over an extended period of time, using a variety of techniques to collect information. Hope this helps.</span>
