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A photograph taken from the air.

In ecology, abiotic factors are the non-living part of an ecosystem.

A large, Y-shaped protein used by the immune system to identify pathogens.

A process of combining two or more numbers to calculate a new value.

A branch of science that deals with astronomical objects (like stars, moons, galaxies, etc.), space, and the physical universe as a whole.

The science or practice of farming, including cultivation of the soil for the growing of crops and the rearing of animals to provide food, wool, and other products.

The envelope of gases surrounding the earth or another planet.

In ecology, abiotic factors are the non-living part of an ecosystem.

A type of reproduction that does not involve the fusion of gametes.

The voltage periodically changes from positive to negative and from negative to positive, and the direction of the current also periodically changes accordingly.