Toxic
Poisonous
Very harmful or unpleasant
Flora and Fauna
Conservationist
Estate
property, garden, land
assets, capital, wealth, riches
Electricity is one type of fossil fuel.
No
Emigrate
Moving to a new land
Leaving one's own country to settle permanently in another.
Tundra
Emigrate
Staying in one's own country
Longevity
Long life
My parents immigrated here when they were little.
Yes, it's correct. We wouldn't say that they emigrated here when they were little.
Diffusion
Habitat
Diffusion
Things staying still?
Consumption
Use, deplete, expend
Genocide
the deliberate killing of a large number of people from a particular nation or ethnic group with the aim of destroying that nation or group
Drought
Urban sprawl
Slow expansion of housing/buildings
Tenement
A piece of land held by an owner
A room or set of rooms that's a separate residence within a house, an apartment.
Remittance
a sum of money sent, especially by mail, in payment for goods or services or as a gift.
Sending money in payment
Aqueduct
Longevity
Short-lived
Migration
Relocating, moving, resettling