Over evolutionary time, many cave-dwelling organisms have lost their eyes. Tapeworms have lost their digestive systems. Whales have lost their hind limbs. How can natural selection account for these losses?
A) Natural selection cannot account for losses, only for innovations.
B) Natural selection accounts for these losses by the principle of use and disuse.
C) Under particular circumstances that persisted for long periods, each of these structures presented greater costs than benefits.
D) The ancestors of these organisms experienced harmful mutations that forced them to find new habitats that these species had not previously used.
Evolutionary relationships of the modern plant phyla.
Continued harvest of (a) cod and (b) mountain sheep by humans has caused evolutionary changes in mat
Some organisms used as models in genetic research
Exophthalmos. The protrusion of the eyes is a common symptom of hyperthyroidism.
Jaundice seen in the eyes and the skin of a patient with hepatitis A.
Middle adults usually have more time to focus attention on their relationships