Systematic error affects the
measurement in a constant way and represents stable factors that affect the
observed score in the same way each time the measurement is made. Systematic
error is a steady, repeatable error joined with faulty measuring equipment or an
imperfect experiment design.
Answer:
unicellular organisms only have 1 cell.these are simple lifeforms. all functions of a living organism takes place within that one cell, because of this it has no ducts or tubes, it has no organs and thus has no organ system (eg:-circulatory system)
Example of unicellular organisms :- amoeba
Multicellular organisms are made up of more than one cell. these are complex organisms. there are exchange of nutrients and gases among different cells by different processes. they have organs and organ systems.
Example of multicellular organism :- Cat
Explanation:
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A Sertoli cell (a kind of sustentacular cell) is a "nurse" cell of the testicles that is part of a seminiferous tubule and helps in the process of spermatogenesis; that is, the production of sperm.
It is activated by follicle-stimulating hormone (FSH) secreted by the adenohypophysis, and has FSH receptor on its membranes. It is specifically located in the convoluted seminiferous tubules (since this is the only place in the testes where the spermatozoa are produced). Development of Sertoli cells is directed by the testis-determining factor protein.