Study of only one or a few organisms for obtaining knowledge about species/higher group is

Which group of organisms comprises 70% of total known species?

The number of known species of organisms on this earth is about

Species is a group of organisms that

Species is a group of organisms that

Species is a group of organisms that

Everyone should have knowledge about his/her blood group as well as the blood group of family members. There are four blood group A, B, AB and O. You consult your family doctor and get more knowledge about blood group. How is the knowledge of blood grouping essential ?

Everyone should have knowledge about his/her blood group as well as the blood group of family members. There are four blood group A, B, AB and O. You consult your family doctor and get more knowledge about blood group. Whether the blood group of an individual is a hereditary character or an acquired character ?

The study about external features of an organism is known as

Everyone should have knowledge about his/her blood group as well as the blood group of family members. There are four blood group A, B, AB and O. You consult your family doctor and get more knowledge about blood group. Whether the genes of blood groups have their dominant and recessive expression?