Sarah was required to learn a list of 20 numbers in order. initially, she took 15 repetitions to learn the list. after five days, she had forgotten the list of numbers and had to re-learn it. this time, she only took eight tries to re-learn the numbers. the difference between the number of repetitions she originally took to learn the numbers and the number of repetitions she took to re-learn the numbers is known as

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

You are working in the lab and are working with the same element but with varying isotopes of the element. you are working with c-11, c-13, c-14, and c-15. what is the average atomic mass of this element? (use periodic table) a- 12 b-15 c-14 d-13

What is a limitation of using a chemical formula, such as c6h1206, to represent a compound? the chemical formula does not show the types of elements that make up the compound. the chemical formula does not show how the atoms are connected to one another the chemical formula does not show the number of atoms of each element in a molecule. the chemical formula does not show the chemical symbols of the elements in the compound