A sample of a radioactive element has a mass of 80g. how much parent and daughter materials are in the sample after two half lives?

It has been proposed that mitochondria and chloroplast are modern descents of early prokaryotic cell that begin to reside and gradually evolve within primitive cells. Which statement supports this view? A.

how do desert animals retain and acquire water in such a hot and dry environment?

Which one of the following statements is true regarding voluntary and involuntary responses? a. involuntary responses may include the spinal cord and not the brain. b. involuntary responses are part of the autonomic system. c.

Which is a part of interphase

Where does the cell theory state that all cells come from? A. Spontaneous Generation B. Genetic Engineering C. Other Cells D. Evolutions

Explain the life cycle of plasmodium?

Compared to terrestrial plants, what challenges do aquatic plants have to overcome in order to carry out photosynthesis?

How are living mammals classified into groups? a. type of circulatory system b. method of development c. method of respiration d. method of regulating body temperature

In the european union what is the geographical unit of water pollution control?

Why is food waste harmful to the environment?