There are three types of polar bears - ones with thick coats, ones with thin coats, and ones with medium coats. It is fall and soon it
will be winter. the temperatures are dropping rapidly and the bears
must be kept warm or they will freeze to death. the bears have had
an average of 2 cubs each, but due to the extreme temperatures,
many mother bears have only one cub left.

Darwin's first point is "A population has variations."
What are the variations discussed in the scenario above?

Explanation is in the file

cutt.ly/nz6VGda

correct answer: understand the different control methods available

integrated pest management is an strategy that is based on the ecosystem and try to prevent the pest and the damage caused by them by applying combination of technique like habitat manipulation, biological control and use of resistant varieties.

the main aim of the integrated pest management is not to completely eliminate the pest but to strengthen the ecosystem so that conditions are favorable for plants and unfavorable for pests.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.