Which is a difference between antibodies and antigens? a. antigens destroy pathogens; antibodies trigger the production of antigens. b. antigens trigger the production of antibodies; antibodies destroy pathogens. c. antigens are components of the lymphatic system; antibodies are components of the immune system. d. antigens are components of the immune system; antibodies are components of the lymphatic system.

B. Antigens trigger the production of antibodies; antibodies destroy pathogens.

Explanation:

Antibodies are proteins that are produced by the immune system. They fight against antigens and kill them. Antibodies are also called immunoglobulins and they are of five basic types.

Antigens are the antibody generating substances. They trigger or stimulates the immune system to produce antibodies. Examples of antigens are bacteria, viruses, or fungi. These are pathogens which cause infections.

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation: