*Question*
Poison causes harm to living things, and lead poisoning is one of the more common poisonings in birds. Given these facts, which causes harm to living things among the following options: - rabies - Oxygen - deadly - HIV - Lead - Carbon - Nitrogen - toxins
**Answer**
Lead

*Question*
Bottleneck effect occurs when a population suddenly gets much smaller, and severe droughts have caused much of the rural population to urbanize. Given these facts, severe droughts may cause among the following options: - evolution - population growth - forest is destroyed - species variation - major threat to health - Dehydration - the ground shaking - a bottleneck effect
**Answer**
a bottleneck effect

*Question*
Soil is formed by weathering, and soils are formed by breakdown of rock. Given these facts, _ is the breakdown of rock. among the following options: - Weathering - mechanical - salinity - heat energy - dangerous - cycles - calcite - started
**Answer**
Weathering

*Question*
Alight bulb is used for seeing in the dark, and electricity can be converted in to light using light bulbs, and even heat by using heating coils. Given these facts, what is used to see in the dark among the following options: - steak - Eye patch - electricity - energy barrier - photons - energy - our nearest star - Wishful thinking
**Answer**
electricity