Questions

Study of Life in outer space or search of life external to Earth is known as Exobiology.

Kingdom is the smallest level of classification.

The level of classification from largest to smallest is :

* Domain

* Kingdom

* Phylum

* Class

* Order

* Family

* Genus

* Species

Our atmosphere is made up of

78% Nitrogen,

21% Oxygen and

1% all other gases like argon, carbon dioxide, neon, and helium.

So, Nitrogen makes up the majority of our atmosphere.

Most organic compounds contain carbon and hydrogen.

Dysfunctional behaviors are maladaptive which means that they interfere with everyday life.

An atom is the smallest particle of a substance. Chemical substances are divided into two major groups. They are

1. Pure Substances (and)

2. Mixtures.

There are two types of pure substances that are Elements and Compounds.

Elements : An element is a substance that is made up of only one kind of atoms and cannot be broken down into simpler substances by chemical means. Metals and Non- metals come under elements.

Examples of elements are Iron, Silver, Gold, Mercury etc.

Compounds : A Compound is a substance that is formed when two or more elements combine chemically.

Examples of compounds are Water, Carbon dioxide, methane, vinegar etc.

Mixtures : A Mixture is formed when two or more substances mixed together but not chemically combined.

Example: Air.

The first wholly artificial gene was synthesized by Har Gobind Khorana.