•Características de los seres vivos. •Células Procariotas y Eucariotas: similitudes y diferencias.

•Reinos: monera, protista, fungi, plantae y animalia. Características de cada uno, ejemplos de seres vivos que los integran.

•Adaptaciones: definición y ejemplos en relación con el ambiente.

•Reproducción: sexual y asexual. Gametas y fecundación. Polinización.

•Sistema reproductor humano: órganos y función. Métodos anticonceptivos y de prevención de enfermedades.​

the answer is: metamorphic rocks often show the presence of fossils, also a

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many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.