Brass gets discoloured in air because of the presence of which of the following gases in air?
a. oxygen
b. hydrogen sulphide
c. carbon dioxide
d. nitrogen

Which of the following statements is accurate about evolution? question 10 options: natural selection only eliminates odd individuals. evolution means that a population never has changes in its genetic frequencies. mutations are always harmful. evolution means that a population undergoes changes in its gene frequencies over time.

The basic types of tissue in the human body are

What class of levers is shown in this image?