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.

Describe the composition of the core of the Earth. Select one: The inner core is composed of liquid iron surrounded by a solid nickel-iron alloy out core. The inner core is composed of solid iron surrounded by a molten nickel-iron alloy outer core.

This May Sound Like A Joke But I'm Looking For A Scientific Answer Which Came First The Chicken Or The Egg?

Osteoarthritis is a disease that results in a thinned or absent layer of cartilage surrounding bones, causing bones to rub against one another. this causes both pain and loss of motion.

How would you expect the stomata of a leaf respond to a drought

Peripheral chemoreceptors sensitive to low blood oxygen levels are located in the

Should animals be bred for dissection? State and support your opinion.

Which statement does NOT correctly describe our sun? A. Our sun is an average sized star B. Our sun is a very old star C. Our sun has an average brightness D. Our sun is yellow-white

One scientist discovered a new theory on the evolution of stars. Why is it necessary for scientists all over the world to agree with the theory before it can be accepted?

Which u. s. states are most likely to oppose strict permit requirements under the Clean Air Act

In a text area below compare and contrast a cell membrane and a cell wall