Why do animal cells mitochondria but no chloroplasts?

Explain why it is important to put a lid on the Petri Dush

Which valves close when the cusps fill with blood

If scientists determine the age of a rock to be three billion years old, what else do they know? A) the rock came from outside the solar system B) the rock was part of a comet C) the Earth is at least three billion years old D) the Earth is younger

A women has been diagnosed with melanoma, a skin cancer that develops in fully differentiated skin cells called melanocytes. She is concerned that the skin cancer risk could be transferred to her future offspring.

How many more phases occur during meiosis than during mitosis?

Explain the importance of atp in muscle contraction and regulation

Compare and contrast an exothermic chemical reaction and an exothermic solution formation by dissociation

What creates the bond between the sodium and chlorine ions

Hag fish have a mostly cartilaginous skeleton. How do they get enough force to tear flesh from the grey whale carcass?

Are viruses alive? Support your answer using at least five of the emergent properties of life. Your answer should include the property of life, how a virus satisfies or does not satisfy that property (for each of the five properties), and your