Sea otters protect kelp forests by consuming the sea urchins that chew through the kelp holdfasts. The ecosystem of a kelp forest would go through drastic changes including significant damage to the kelp and all organisms that depend on the kelp if the sea otther was removed. This is a perfect example of:

Apart of the periodic table is shown. a portion of the sixteenth and seventeenth columns of the periodic table is shown. column 16 reads eight oxygen, 16 sulfur, and 34 selenium. column 17 reads nine flourine, 17 chlorine, and 35 bromine. which of the following elements is less reactive than the others? bromine (br) oxygen (o) selenium (se) sulfur (s)

Which of the following is a way that minerals are used? a. industry construction technology d. all of the above

How many chromosomes does each human cell contain? a. 23 chromosomes b. 26 chromosomes c. 43 chromosomes d. 46 chromosomes