Questions

The world's largest weapons importer is Saudi Arabia.

Convection is by far the most efficient and common way for heat to be transferred through liquids and gases. It occurs when some regions of a fluid get hotter than others, causing currents in the fluid that move it around to distribute that heat more evenly.

A microscope is an instrument that magnifies objects. Cells that were first observed by Robert Hooke in the year 1665 in the compound microscope.

Amphibians are one of the most sensitive groups to change, whether that is caused by habitat loss, invasive species, disease, trade or climate change. Their sensitivity to environmental threats has been generally linked to the observation that amphibians are characterized by a rather permeable skin. Given their complex life cycles and other traits, amphibians are often recognized as indicators of ecosystem health.

The Bill of Rights, also known as the English Bill of Rights, is an Act of the Parliament of England that sets out certain basic civil rights and clarifies who would be next to inherit the Crown.

A candidate key is a column, or set of columns, in a table that can uniquely identify any database record without referring to any other data. Each table may have one or more candidate keys, but one candidate key is unique, and it is called the primary key.