How much of this rock (in kg) must be processed to obtain 4. 3 metric tons of lead?.

What is the mass of phosphorous in a 51-kg person

What will most likely happen in the absence of a cell membrane? a) photosynthesis will not take place. b) the cell will not store food, water, nutrients, and waste. c) energy will not be released during cellular respiration. d) substances will pass in and out of the cell in an uncontrolled manner.

Which fossil fuel is mainly used for heating and cooking? a. electricity b. coal c. petroleum d. natural gas