Answer:
contract and retract
Explanation:
tract = pull or draw something towards you
<span>It can improve students' reading comprehension.It teaches students how to ask questions about their reading and where to find the answers to them.It helps students to think about the text they are reading and beyond it, too.<span>It inspires them to think creatively and work cooperatively while challenging them to use higher-level thinking skills.</span></span>
Ecologists use survivorship curves to visualize how the number of individuals in a population drops off with time. In order to measure a population, ecologists identify a cohort, which is a group of individuals of the same species, in the same population, born at the same time.
