Antibodies are the first type of antibody produced in response to an infection. They activate the complement system. antibodies are found in exocrine gland secretions, such as within the nose, breathing passages, digestive tract, ears, eyes, and vagina. They defend against bacteria and viruses.

Which of the following sex and generation combinations directly produces the pollen tube of angiosperms? a) male gametophyteb) female gametophytec) male sporophyted) female sporophyte

The earth consists of a variety of different organisms. despite their diversity, however, some similarities on the structural and metabolic levels may be seen. these similarities can be attributed to a. similarities among organisms in their proteins and nucleic acids. b. the ability of organisms to readily adapt to sudden environmental changes. c. similarities in organisms' habitats and niches. d. the ability of all organisms to interbreed and produce new species.

Which of the follow describes a disadvantage secondary sources have compared to primary sources?