A is my best friend.

He is recognized as a runner-up champion.

He is considered a second-rate student at school.

The subtropical climate is humid and hot all year round.

He has a deep interest in parapsychology.

He is an expert in primatology and is engaged in the study of gorilla behavior.

Cytogenetics is a science that studies the structure and function of chromosomes and genes.

He is an expert in nuclear physics.

He is an expert in nuclear physics and has won many awards in the field.

Functional analysis is a branch of mathematics that studies the properties of functions in infinite-dimensional spaces.