Molecules -

1. Molecules refers to combinations for more than 1 atom.

2. A molecule is molecular level and have its chemical properties.

3. It is at the chemical level that represents chemical properties of that element through out the reaction.

Particles -

1. Particles are not clear word in their sense. Particles refer to any assumed small thing that exist

2. It is not necessary that a particle have its own chemical properties.

3. It is not chemical level of organisation. It can be notices with nacked eyes or using simple microscope.

The word Australopithecus is derived from Latin word ‘austral’ means southern and a Greek word ‘pithekos’ which means ‘apes’. Hence, the word means southern apes (Southern Monkey). The earliest human is called so because he resembles them.

The elastic collision formula comprises two parts, namely elastic collision formula for kinetic energy and elastic collision for momentum. 

However, Follow the Table Below to Understand What each Component in the Equation Signifies –

Therefore, the formula for elastic collision kinetic energy is – 

On the other hand, the elastic collision derivation for momentum is – 

m1 u1 + m2 u2 = m1 v1 + m2 v2

A fundamental way to make sure whether a collision is elastic or inelastic is by equating their total kinetic energy. In case it remains the same as before and after the said collision, you can label it as elastic collision. Contrarily, a shift in the total kinetic energy suggests that the category of collision is inelastic. 

However, the energy loss for inelastic collision usually dissipates into sound and heat energy. It helps in maintaining the balance of energy before and after.

Why were mobile animal herders not necessarily a threat to town life?

A:

Mobile animal herders were not necessarily a threat to town life, because with the people living in towns, they needed to exchange young animals, cheese, leather and meat in return for grain and metal tools. However, they had conflicts with the people living in agricultural villages. The herders raided the villages and seized their stored goods.

Various career options in physical education are: 

(a) Athletic Coach: Organise, instruct, and teach amateur and professional athletes. 

(b) Corporate Fitness Instructor: Help clients to assess their level of physical fitness and help them to set and reach fitness goals. 

(c) Cardiovascular Fitness Instructor: Conduct group exercise sessions that involve aerobic exercise, stretching and muscle conditioning.

(d) Sport Media careers: Journalism, Photography, Writing, Art and Broadcasting.

(e) Reader in Physical Education: There is scope to grow from a Lecturer to a Professor and then to a Reader.

(f) Nutrition Specialist: Plan food and nutrition programs and supervise the preparation and serving of meals. Advise Sports Nutrition.

teaching career in physical education.

Physical education has traditionally been declared as a professional field. Appropriate career offers many rewards to the teachers whether they are engaged in elementary school, middle schools, high schools, senior secondary schools, colleges or universities. This career is usually considered to have many benefits. The teacher, in the field of physical education, has deep respect among the students because he makes a good contribution to society. This career provides internal satisfaction:

1. Elementary School
2. Middle School
3. High Secondary School
4. College and University

These are teaching opportunities in the field of physical education at different levels.

1) FIFA World Cup

2) UEFA European Championship

3) Copa America

4) Copa Libertadores

5) Federation Cup

6) Indian Super Cup

7) Santosh trophy

8) IFA Shield

9)Durand Cup

badminton

Uber Cup, trophy representing the women's world championship in the sport of badminton. The cup was contributed by Mrs. H.S. Uber, former English champion, in 1956 for a series of women's international team competitions to be held every three years.

The narrator, James Cook and his wife spent seventeen years training for three year journey they had planned.

• The question has been asked from the story We are not afraid to Die.
• The author and his wife made plenty of plans for their sea trip around the globe.
• They've been seventeen years training for this trip. They professionally built their boat for the voyage.
• The narrator and his wife have trained themselves psychologically and physically to experience such a journey

A tournament is a competition held among various teams in a particular activity according to a fixed schedule where a winner is decided. Fixture of 13 teams. Total teams =13. Total matches = N – 1 = 13 – 1 = 12 matches. Number of teams in upper half

Demand curve is a curve that is used in Microeconomics to determine how much quantity of any particular commodity that people are willing to purchase with corresponding changes in its price.

It is represented as the price of the commodity on y-axis and the quantity demanded at the x-axis in a graph.

Demand function shows the relationship between quantity demanded for a particular commodity and the factors that are influencing it.

The narrator's mother felt Mrs Dorling was a very kind and generous lady because every time she came to their house she took the beautiful antique plates, crockery, cutlery and the silverware  because she said she liked to save the nice things. She insisted on taking all their nice things on the pretext of saving them. The narrator's mother was too simple to understand the lady's motive behind her kindness.

• Chemicals or molecules present in the living organism are known as biomolecules. Biomolecules are divided into two types- inorganic and organic.
• Inorganic biomolecules includes minerals, gases and water and organic biomolecules includes carbohydrates, fats, proteins, nucleic acids, vitamins, etc.