Answer:
The answer is A
Explanation:
The teeth grinds the food and that is physical and the saliva breaks down the molecules, so that is chemical
Answer:
- An element is a pure substance that cannot be broken down into a simpler form.
- All elements are listed on the periodic table of elements.
- An element symbol begins with a capital letter; if there is a second or even third letter, it is a lowercase letter
Explanation:
An element is one of the two types of pure substances i.e. substances that cannot be broken down into simpler forms. Elements are made up of only one type of atom e.g. Fe, Cl2 (two chlorine atoms).
All known or discovered chemical elements are represented on the periodic table. In an order of increasing atomic number, elements are arranged from left to right on the periodic table.
The symbol of an element begins with a first letter written in capital letters while the subsequent letters can be written in lower cases. For example, Fe, Cu, Hg, Zn etc.
Answer:Humans raise large numbers of cattle for food. How will these herds of cows affect Earth's atmosphere? Increase C02 in the atmosphere 6. Analyze: In many tropical rainforests, people clear land by cutting down trees and burning them
Explanation:
Water may become polluted and also become scarce to the agriculture due to the population increase
he discovered a honeycomb-like structure in a cork slice using a primitive compound microscope.