13 Which of the following chemical compounds

used in coolants and aerosol products have

depleted the ozone layer?

A H, O and CO,

B CFCs

C O, and CO,

D sulfuric acid and nitric acid

Is a rabbit a second level consumer or a first level consumer

The expression of a gene is said to be ‘turned on’ when certain signals interact with the promoter of a gene and RNA is produced. The strand of RNA that corresponds to a gene is complementary to the sequence of DNA.

A divice used to measure the amount of air pressure needed to move a dial or mercury is called a?

Why do you think primary productivity is important for the health of an ecosystem.

How do the circulatory, excretory and respiratory systems work together to maintain pH homeostasis?

Which of the following does not contain carbon and energy iron ice cream lettuce or eggs

In what ways has poland suffered because of its lack of natural barriers

Which of the following statements is/are true? a. Loose connective tissue includes cartilage. b. Closely packed bundles of collagen fibers are characteristic of loose connective tissues. c.

Identify twice substances that can cause changes in DNA

In which of the following cells can more than one nucleus be found? A. An unfertilized egg B. Neuron C. Sertoli cell D. Muscle fibre