Cephalization describes the process by which organisms develop a distinct head. The head of a cephalized organism contains a concentrated group of nerves, or brain, that controls the rest of the organism, as well as specialized organs for consumption and perception, like mouths, eyes and ears. Cephalized organisms exhibit a distinct division between parts of the body; they have a front, back, top and bottom. These animals comprise the bulk of animals that are encountered on a daily basis.
sea star following organisms exhibits cephalization
Density <span>water allows large organisms like the blue whale to swim in the ocean and not be crushed by their body weight.</span>
Biotic factors are those that are living in an ecosystem, such as plants and animals, while abiotic factors are those that are not, such as rocks, temperature, water, sunlight, soil etc.
C is correct for number 2 because broadleaf trees are a biotic factor, while precipitation, or rainwater, is abiotic.
A is incorrect because both are biotic factors, since both are living
B is incorrect because both are abiotic factors, since both are nonliving
D is incorrect because both are biotic factors, since both are living
