What is the difference between science and pseudoscience
a. science is done only in a laboratory, while pseudoscience is done in the "real world.
b. scientific claims can be verified through observation and experimentation, while pseudoscientific claims cannot.
c. scientific claims are biased, while pseudoscientific claims are unbiased while
d. pseudoscience is based on empirical evidence, while science is based on observation and e based on observation and experimentation.

B. Scientific claims can be verified through observation and experimentation, while pseudoscientific claims cannot.   At least I think it is right.

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.