In the study of human evolution, scientists define modern in terms of: a. traits like large browridges, large nasal sinuses, and a large masticatory complex. b. a series of distinctive anatomical traits that contrast with archaic traits from earlier hominins. c. a designated timeframe between the upper and lower paleolithic. d. a series of anatomical traits that distinguish cro-magnon features from neandertal's.

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed

There are only about 250,000 known fossil species. true or false

Deserts (especially true deserts) are not easy places for animals to live. animals who live in them often have special features that them survive. which adaptation would be for this group of animals? a) keen eye sight b) short, narrow legs c) tolerate heat d) webbed feet