Plants perform the function of photosynthesis, in which they liberate oxygen gas. Thus, animals depend on plants for getting oxygen gas for breathing. 

The carbon dioxide of air being consumed by plants in photosynthesis is constantly put back into air by the respiration of animals and plants as well as by the burning of fuels by human beings. The plants depend on animals for getting carbon dioxide gas for photosynthesis.

Thus, plants and animals maintain the balance of oxygen and carbon dioxide in air and show their interdependence in nature.

Ways to conserve water are as follows:

1. Turn off the tap immediately after use. Get the leaking taps repaired immediately.
2. Take bath by filling water in a bucket and not directly under the flowing tap.
3. Wash the utensils by filling water in basin and not under the running water.
4. Use the water from washing rice, vegetables or fruits for watering the plants at home.
5. Do not use a full flush from the cistern in the toilet when a half flush is sufficient.

Excessive rain causes floods. The excessive rainfall due to heavy rains leads to many problems. Some of them are:

1. Heavy rains in the city lead to waterlogging of roads and streets which causes inconvenience to the people.
2. Heavy rains may cause floods as the river water starts overflowing from its banks and spread over a large area of land.
3. The animals living in water are carried away by the fast flowing flood waters.
4. Heavy rains also kill the animals living in soil as they do not get air to breathe when the soil gets covered with flood water. The people living in areas having drought conditions face many difficulties. Some of the problems faced by people are: i. In drought conditions, the soil does not have sufficient moisture to grow crops leading to shortage of food for people. ii. In drought conditions, the vegetation such as grass and other fodder does not grow well leading to shortage of fodder for domestic animals.iii. Due to shortage of food and fodder, many people living in drought areas migrate to other places along with their domestic animals in search of food and fodder. Some people and domestic animals may die of starvation.

So, we should supply food and fodder to the victims of drought.

Energy saved is energy generated. We cannot keep on producing non-renewable resources like petrol, diesel and electricity. So the need of the hour is the better utilization of existing resources. Energy depletion has become a global phenomenon at present time. The ever biggest problem that man has to face in near future is the energy crisis. Energy conservation is the most economical solution to shortages. Energy conservation reduces energy consumption and energy demand per capita. It refers to the preservation and maintenance of natural resources like water, soil, forest and mineral oil to meet human needs with proper care given to aesthetics and recreations too.

Mumbai imported Humboldt penguins from South Korea in the zoo.Humboldt penguins grow only up to around 2ft and that they don’t need snow. The water and air temperature in their enclosure has been set at around 14 degrees Celsius, just right for them.

1. We should eat high calcium foods as calcium is the most important mineral for bone health, and it's the main mineral found in your bones.

2. Vitamin D and vitamin K are extremely important for building strong bones. Vitamin D plays several roles in bone health, including helping your body absorb calcium. So we should sit under the sun.

3. Omega-3 fatty acids are well known for their anti-inflammatory effects. So, we should consume food rich in Omega- 3 fatty acids that protect against bone loss during the aging process.

4. Proteins are needed for the growth and repair of our body and helps in building strong bones.

Samudragupta is considered to be the greatest king of the Gupta Empire. Some historians also equate him with Ashoka the Great. Historians have come to know about him through the coins and inscriptions. One inscription on an Ashokan pillar in Allahabad gives a detailed account about Samudragupta. It was a prashasti; written in the form of a long poem by Harisena. Harisena was a court poet of Samudragupta; around 1700 years ago.

Kabadiwala buys waste from us for recycling

The Shakas

The Greeks were followed by the Shakas. Shakas were divided into five branches.

• One branch of Shaka was powerful in upper Deccan

• The second branch was influential in Punjab with Taxila as its capital

• The third one established its hold over western India

• The fourth branch settled in Mathura

• And the fifth branch settled in Afghanistan

Among these five branches, the only branch to maintain its hold over a long time was the branch which ruled in western India.

Parthians
The Shaka rule in north-western part of India was followed by the Parthians. It is said that Parthians had their roots in Iran and from there they migrated to India. However as compared with the Shakas and Greeks, they ruled over only a small portion of north-western India in first century AD.

The most renowned Parthian king was Gondophernes in whose reign St. Thomas came to India to propagate Christianity.

Waste materials especially household wastes are called garbage. The garbage collected in dustbins in our homes, shops, offices and schools are taken away by sanitary staff and is dumped and disposed of according to the nature of garbage. There are two types of components in the garbage – useful and useless components.

Anthony Edward "Tony" Stark, simply known as Tony Stark, and also known as the famous Super-Hero named Iron Man, was a character that appeared in the Iron Man trilogy films and in The Avengers movie. He was portrayed by actor Robert Downey, Jr., and was based on the character of the same name in the comics.

The work of Patwari includes the following:

1. Maintenance of land records
2. Collection of land revenue

Birds don't get shocked when they sit on electrical wires because they are not good conductors of electricity.

Their cells and tissues do not offer electrons an easier route than the copper wire they're already traveling along. As a result, the electricity bypasses the birds and keeps flowing along the wire instead.