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.
Organisms exhibit a diversity of behaviours, which include (clockwise from upper left), foraging and
An Estimate of the Time of Global Peak Conventional Oil Production
Different time courses of hypersensitivity reactions.
Apply circular friction and direct pressure to suboccipital muscles one side at a time.Turn head to ...
Increased amounts of "screen time" are contributing to decreased amounts of physical ...
Physics: Power, Energy and Time