Covalent bonds are formed when two atoms are able to <em>share</em> electrons.
Iroinic bonds are form when two atoms are <em> </em> electrons from each other to complete the bond. This results in a pair of ions.
<u>Covalent bonds:</u>
- Have a definite shape.
- Have a low melting point.
- At room temperature they are in a liquid or gas.
- They occur between two non-metals.
<u>Ionic bonds:</u>
- Have no definite shape.
- Have a high melting point.
- At room temperature they are solid.
- They occur between a metal and a nonmetal.
All living cells arise from pre existing cells.
Explanation:
This picture illustrate what type of selection 2 directional
an industrially developed country
Explanation:
A declining birthrate can be attributed to an industrially developed country. Birthrate is the number of births per thousand of population in a year.
- Several factors contributes to variations in birth rates some of which are:
- Economy
- Religion
- Social structure
- Family planning
- Culture
- Education
- A declining birth rate can be attributed to industrially developed countries.
- In such countries, more women take part in the workforce.
- When women becomes employable and serves as industrial workers, they are not likely to tend to reproduce more.
- This can lead to a decrease in birth rate.
Learn more:
Population trend brainly.com/question/13181732
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