Questions

Africa - 54 countries

South America - 12 countries

Antarctica - 0 countries

Europe - 43 countries.

Hence, Antarctica continent has the least countries.

Database provides necessary means to achieve this abstraction. By structure of a database we mean the data types, relations, and constraints that should hold on the data.

The number of cell layers and cell types together give rise to 6 different types of epithelial tissue.

1. Simple squamous epithelia

2. Simple cuboidal epithelia

3. Simple columnar epithelia

4. Stratified squamous epithelia

5. Stratified cuboidal epithelia

6. Stratified columnar epithelia

Stratified squamous epithelia is best suited for areas subject to friction.

Japan's - Japan Aerospace Exploration Agency (JAXA) has successfully launched the world's smallest rocket with the ability to put a tiny satellite into orbit. Rocket -  SS-520 which was pnce failed in 2017 lifted off from the Space Center carrying a microsatellite TRICOM-1R, a three-unit CubeSat weighing about 3 kilograms. The CubeSat will now be used to collect images of the Earth's surface via multiple cameras.

Pitot tube is used to measure stagnation pressure.

Countries with autocracy-based governments i.e, Monarchy have a single ruler or a monarch until his death.