A small amount of nitrogen is fixed by lightning, but most of the nitrogen harvested from the atmosphere is removed by nitrogen-fixing bacteria and cyanobacteria (formerly called blue-green algae). The nitrogen cycle transforms diatomic nitrogen gas into ammonium, nitrate, and nitrite compounds.
Answer:
Sistema excretor. El sistema excretor o sistema urinario es un aparato del cuerpo humano. Está formado por los riñones y la vía excretora, en él ocurre el proceso excretor, que consiste en limpiar la sangre de sustancias de desecho formando la orina y expulsarlas al exterior por la uretra.
Explanation:
The two types are Alcoholic fermentation and lactic acid fermentation.
Answer:
The sporophyte body comprises a long stalk, called a seta, and a capsule capped by a cap called the operculum. The capsule and operculum are in turn sheathed by a haploid calyptra which is the remains of the archegonial venter. The calyptra usually falls off when the capsule is mature.
Answer:
systolic - pumping, diastolic - relaxed
Explanation:
the period of contraction is called systole, and the period of relaxation is diastole. when measured, your systolic pressure is when the heart is pumping, and diastolic is in between beats when the heart relaxes. hope this helps :)