En un bosque se han formado, con la energía del sol, un total de 1,8 · 10 34 kg de materia nueva. Si el total de la masa de plantas que han absorbido esa energía es de 3,5 · 109 kg y el gasto en respiración de esas plantas fue de 6,3 · 1028 Julios, calcula: a) La producción primaria bruta y neta (PPN y PPN)

b) La productividad

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

the answer is cell division : )

you know that this symptom is misleading and quite often is related to: heart attack

a heart attack is a condition that occurs when the blood flow that transports oxygen to the heart muscle is damaged or cut off completely. the coronary arteries that supply the heart muscle with blood flow can be blocked by the accumulation of plaque. also, when the plaque within the heart artery breaks, it creates blood clot that can also hinder the blood flow. men that are over 45years of age and women that are over 55years of age are at risk of having a heart attack. the symptoms of a heart attack include chest discomfort, chest pain, coughing, and shortness of breath.