Questions

Atomic weight=number of neutrons+number of protons

They are the sites at which microtubules attach to chromosomes.

In chemistry, a metal is an element that readily forms positive ions (cations) and has metallic bonds. Metals are opaque, lustrous elements that are good conductors of heat and electricity. Most metals are malleable and ductile and are, in general, denser than the other elemental substances.

Examples of metals are aluminium, copper, iron, tin, gold, lead, silver, titanium, uranium, and zinc.

Here Se - Selenium is an element but is not a metal, S - Sulphur is not a metal and I - Iodine is also not a metal.

Hence, Zn - Zinc is the only metal in the given options.

The oldest generally accepted fossils of large animals range in age from 565 to 550 million years old.

Lagoons are formed along the coasts by the action of winds and waves. They are commonly found off the deltas of large rivers such as the Nile and Ganges.

1. Address lines to refer to the address of a block

2. Data lines for data transfer

3. IC chips

4. Processing data