Which of the following is an example of mutualism? a. a group of piranhas work together to attack a large animal. b. a mosquito feeds off the blood of another animal and leaves an itchy bump. c. barnacles attach themselves to the bottom of a boat for transportation. d. a sea sponge attached to a crab the crab hide from predators and gains transportation for itself.

sexual reproduction produces offspring with novel combinations of genes. species that reproduce sexually must maintain two different types of individuals, males and females, which can limit the ability to colonize new habitats as both sexes must be present.

a motor homunculus represents a map of brain areas dedicated to motor processing for different anatomical divisions of the body.

homunculus represents the importance of various parts of your body as seen by your brain. as a result, they take up a lot of brain space. although the cortical homunculus is a curiosity, penfield's work in mapping the brain's relationship to the body was invaluable.