Physical change happens when the physical mass and texture of a certain thing changed without changing the chemical state of the said thing. While chemical change happen when the chemical of the substance change even without changing its physical state.
The correct option is BY CONDUCTING EXPERIMENTS THAT EXPOSE THEIR PROPERTIES. Scientific investigations are always ongoing in all parts of the world, scientists strive to build on existing knowledge by carrying out more experiments that are targeted at obtaining more information above that which is already known.
1. Planting Vegetation as ground cover: Farmers<span> plant trees and grass to cover and bind the </span>soil<span>. Plants </span>prevent<span> wind and water </span>erosion<span> by covering the </span>soil<span> and binding the </span>soil<span> with their roots. The best choice of plants to </span>prevent soil erosion<span>are herbs, wild flowers and small trees.</span>
<span>These organisms are called autotrophs. Autotrophs are also called 'self-feeders,' and they are able to produce energy from sunlight and carbon dioxide and are therefore known as 'producers.' The only autotrophs that we know of are plants and some types of algae. This makes all other organisms heterotrophs</span>
Rectus abdominis is a skeletal muscle found in the front part of the body which begins from the sternum and ends at the pubic zone.
Rectus abdominis is also known as "Abs" which viewed externally appears to be six, eight or ten in number.
These muscles are innervated by the thoracoabdominal nerves which carry and transmit signals to CNS and to the muscles back. The main spinal nerve which controls the movement of Abs is known as the "ventral ramus".