The ultimate source of heat in the process of global warming is
a. the burning of fossil fuels
b. carbon dioxide
c. the sun
d. greenhouse gases

The ultimate source of heat in the process of global warming is greenhouse gasses. Correct D The greenhouse gasses are gasses that have the property of absorbing infrared radiation emitted from Earth's surface and reradiating it. They  include water vapour, carbon dioxide, methane, nitrous oxide, ozone and some artificial chemicals such as chlorofluorocarbons (CFCs) and are the main reason for the greenhouse effect, which is a natural process that warms the Earth's surface.

(bro she is ancient)

j < 14

j is jakes age

since jake is younger it makes his age less than his sisters

(if you meant she is 14)