Cephalopods such as squid and octopi can communicate by changing skin colors and sometimes even skin patterns. this type of communication is an example of a

a chemical signal
b. sound signal
c. language
d. visual signal

When water freezes, it . contracts expands

The image shows the evolution of a species of fish. a few fish from a population developed different social behaviors and evolved into different species. two fish according to the image, the fish underwent . the new species of fish had mating seasons that were different from that of the original fish. because of the differences in mating seasons, the fish underwent reproductive isolation. this mode of isolation would be .

Which is abiotic? a. tree sap b. insect c. sunlight d. wood table