Describe the four main spheres of earth. 1. lithosphere: 2. hydrosphere: 3. atmosphere: 4. biosphere:

The four main spheres of Earth are as follows:  

1. Lithosphere: It is also called geosphere and is formed of the core of the Earth, the crust, mantle, ocean floor, sand, mountains, asphalt, rocks, and others.  

2. Hydrosphere: It is formed of everything that comprises water like rivers, oceans, lakes, rain, snow, and ice caps.  

3. Atmosphere: It is formed of gases like hydrogen, oxygen, water vapor, the wind, and the ozone.  

4. Biosphere: It comprises all the living components like animals, plants, humans, microbes, insects, and others.  

gametes or germ cells are haploid cells (example: sperm and ova) containing only one set (or n) number of chromosomes and autosomal or somatic cells are diploid cells containing 2n number of chromosomes.