The correct answer is the Glyptal. The term "natural polymers" refers to compounds that are produced naturally. Glyptal is a synthetic polymer and does not exist in nature. The polymer substance formed from glycerol and phthalic acid is known commercially as glyptal.

The Aryabhata spacecraft, named after the famous Indian astronomer, was India's first satellite; it was completely designed and fabricated in India and launched by a Soviet Kosmos-3M rocket from Kapustin Yar on April 19, 1975.

Thus, a metal used in storage batteries is Lead.

For short durations of time, sounds up to a 120 dB are bearable and also considered safe by the world health organization, but again, listening to sounds at such high frequencies at regular intervals of stretched time durations is totally unsafe and makes the ears vulnerable to permanent hearing loss.

An autotroph is an organism that can produce its own food using light, water, carbon dioxide, or other chemicals. Because autotrophs produce their own food, they are sometimes called producers. Most autotrophs use a process called photosynthesis to make their food.

World Environment Day is celebrated on June 5 every year to remind people to save nature and the earth by stopping their non-environmentally friendly activities. Let's know more about this day, its history, significance, and theme.

Ecology is the study of the relationships between living organisms, including humans and their physical environment. The German scientist Earnst Haeckel was the first to use this word in 1869.

Lakshadweep was formerly known as Laccadive, Minicoy and Aminidivi Islands.