True or false questions.. 1. The higher the altitude the lower the air pressure

2. The ozone protects life at earths surface

3. Airplanes fly in the thermosphere

4. The atmosphere is made of mostly oxygen

5. There is a hole in the ozone layer

(! ) what’s fracking and what does it have to do with carbon, carbon dioxide, or fossil fuels?

Which of the following statements is true? a. there are more chromosomes in an organism than there are genes. b. there are more genes in an organism that there are chemical bases. c. dna is made of sugar, phosphate, and carbon. d. genes are found in specific locations on a chromosome.

Multicellular organisms use cell division, mitosis, for growth and the maintenance and repair of cells and tissues. single-celled organisms may use cell division as their method of reproduction. regardless of the reason for mitosis, the process ensures genetic continuity. what is the step in the cell cycle that ensure genetic continuity?