Which of the following represents the contribution of Julian Huxley to the field of biology?

Practice drawing various animals and plants.

$ICZN$ stands for the naming of:

The language used in writing the scientific names of animals is

The study of ants is known as:

$Nicotiana \ sylvestris$ flowers only during long days and $N. \ tabacum$ flowers only during short days. If raised in the laboratory under different photoperiods,they can be induced to flower at the same time and can be cross-fertilized to produce self-fertile offspring. What is the best reason for considering $N. \ sylvestris$ and $N. \ tabacum$ to be separate species?