Nails are made of iron because, iron is strong and sturdy; although nail rust when it undergoes oxidation when expose to water but it is not explosive.
Barium and phosphorus are not suitable for nail making because of their properties.
Barium is an element which reacts with virtually all non metals, forming poisonous products which are dangerous to health and to the environment. It also reacts explosively with water.
Phosphorus is not found in its pure form in nature, it conducts electricity and it is combustible in nature.<span />
Answer:
1. Their rounded shape allow them to joint properly with other bones, permitting a softer, better motion.
2. Provide protection for specific organs and their shape provides a broad surface for the proper attachment of muscles.
Explanation:
The bone is a <u>connective tissue composed of specialized cells, a mineral-salt matrix, and collagen fibers</u>. The main functions of the bones are <em>organ protection, structure, red and white blood cell production and support.</em>
There are different types of bones:
- Long
- Short
- Flat
- Sesamoid
- Irregular
- Sutural
Some bones, such as the humerus and femur, are characterized by their rounded ends, also known as <em>epiphyses </em><em>(epiphysis - singular)</em>. The reason behind epiphyses is joint function. These bones are long bones, and their rounded shape allow them to ajoint properly with other bones, permitting a softer, better motion.
On the other hand, flat bones, such as vertebrae and carpals, provide protection for specific organs and their shape provides a broad surface for the proper attachment of muscles.
Plants, fungi, and prokaryotes are types of organisms that have cells that contain a cell wall. A plant's cell wall is made up of cellulose, cellulose uses light energy to be able to perform photosynthesis. A fungi's cell wall is made up of cithin, and these organisms reproduce by using spores instead of seeds. And a prokaryotic cell wall is made up of peptidoglycan or murien, and it gives the cell its shape and it also surrounds the cytoplasmic membrane.
Photons of blue light have a higher energy level than photons of green light
