Analyst Questions

The ozone gas present in the atmosphere absorb ultraviolet radiation. It is spread as a ozone layer throughout the stratosphere.

Foreign keys are the columns of a table that points to the primary key of another table. They act as a cross-reference between tables.

In detail : A Foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table or the same table. In simpler words, the foreign key is defined in a second table, but it refers to the primary key or a unique key in the first table.

The price elasticity of supply measures how the responsiveness of the quantity demanded of a commodity to changes it its prices; defined as the percentage change in quantity demanded divided by the percentage change in price.

A clade is a group of ancestral species and all its descendants. Hence it is a branch of one same species and so monophyletic.