How does mining impact the environment?

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

Ts assignment - snow day assignment genetic variation and natural selection natural selection relies on genetic variation. in any population of beetles, there are alleles for brown or green color. what happens to the genotype and the phenotype of the beetle population when there are distinct advantages and disadvantages due to color? order the steps that take place during natural selection in this beetle population.

Which of the following statements about a typical plasma membrane is correct? a. the plasma membrane is a covalently linked network of phospholipids and proteins that controls the movement of solutes into and out of a cell. b. the two sides of the plasma membrane have different lipid and protein composition. c. the hydrophilic interior of the membrane is composed primarily of the fatty acid tails of the phospholipids. d. phospholipids are the primary component that determines which solutes can cross the plasma membrane. e. carbohydrates on the membrane surface are important in determining the overall bilayer structure.