(d) Veins have different structures from arteries. State two features of veins and explain how these features enable them to function efficiently.

1. Featu

Explanation

2. Featu

Explanation​

The virus is considered to be are living item since they have hereditary material dnas or rnas. they can imitate and change. they respond to boosts, for example, radiation, chemicals, and warmth. they have antigenic properties. they are proficient to duplicate with a same hereditary constituent.

Aneutral atom must have the same number of neutrons and protons? no, they must have the same number of protons and electrons