Según el estudio de la materia, es todo lo que se puede representar con un símbolo o con una formula química. A) El peso.

B) Las mezclas.

C) Las sustancias puras.

D) Los pesos específicos.

lysosome is this part of the cell is surrounded by a very thick outer membrane to protect the rest of the cell from its strong enzymes.

true                                                                                                       true true true true true true

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.

links? do you have a link? i don't see anything?