For a mark-recapture survey, when there were 12 marked elephants recaptured to the total 130 elephants (includes both marked and unmarked) in the second capture, we know scientists have initially marked 45 elephants at the beginning.
The estimated total elephant population would be elephants based on the mark-recapture equation.

true                                                                                                       true true true true true true

the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

explanation:

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.

if you listed your answers right then i believe your answer is b.