Modern humans first appeared during the

a. most recent period of the cenozoic era.
b. most recent period of the mesozoic era.
c. earliest period of the cenozoic era.
d. earliest period of the mesozoic era.

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

According to piaget, children have acquired the cognitive skill of conservation when they're able to a. understand that six ounces of liquid in a jar and six ounces in an elongated tube are equal. b. understand the viewpoint of other people. c. relate objects around them to their own needs. d. realize that the term heavy describes an object one way and the term big describes it another way. it is not b nor c. did this 2 x wrong..

Mr. olajuwan was in a horrific snowmobile accident. afterwards he had trouble walking and he had a loss of balance. which of the 4 major brain region was probably demaged