The roots of most plants have root hairs near their tips. Researchers grew two types of plants, A and B, in soil with different concentrations of
phosphate ions. They measured the mean number of root hairs in a small area of the
roots, and also the mean length of the root hairs.

Ascientist observes certain changes in the physical features of a particular species over time. she concludes that the species has undergone evolutionary change. she wants to study the animals by analyzing their population. she’ll use . the population of this species is decreasing considerably. if this trend doesn’t change, this species will fall under the category of animals. this is a plato question,i need to make up his biology credit.