*Question*
Coal is used to produce electricity by burning in coal-fire power stations, and coal-fired power stations can cause acid rain and contribute to global warming. Given these facts, certain types of electricity production can cause acid rain and contribute to: among the following options: - global cooling - global warming - energy usage - coal mining - deforestation - electrical - Destroy bridges - salinity
**Answer**
global warming

*Question*
Earth orbiting the Sun causes seasons to change, and seasons are caused by the tilt of the axis relative to the planet's orbit. Given these facts, what causes earth's seasons among the following options: - principals of aerodynamics - Physical weathering - floods - the tilt of the planet - an external framework - dry conditions - axis rotation - relative location
**Answer**
the tilt of the planet

*Question*
Plasma cells are activated B cells that secrete antibodies, and antibodies are the bodies way of fighting infection. Given these facts, what do plasma cells allow our bodies to fight among the following options: - resistance - parasites - infection - illness - Hostile armies - invasion - hair - Leptospirosis
**Answer**
infection

*Question*
Fertilization occurs when a sperm and an egg fuse to form a diploid zygote, and male gametes are called sperm. Given these facts, what is formed when a male gamete and an egg fuse together among the following options: - Plant reproduction - simple zygote - spread flower seeds - diploid zygote - Chemical energy - peachleaf willow - duplex zygote - reproductive zygote
**Answer**
diploid zygote