Numerical concept of vector

Huygens concepts of secondary wavelets

Assertion: Biological concept of species is based on reproductive isolation. Reason: Biological concept of species is universal.

A : Biological concept of species is based on reproductive isolation R : Most accepted species concept was given by Linnaeus

Typological concept of species was given bt

Biological concept of species is mainly based on

Who gave the biological concept of species?

Biological concept of species was given by _____ and it is based on _____

What are the minimum number of forces (all numerically equal) whose vector sum can be zero ?

Explain the concept of direct variation.

The concept of chemical evolution is based on :