Answer:
If the products are at a higher energy level than the reactants, the reaction must have absorbed energy. If you have to heat the reactants to keep the reaction going or if it cools down during the process, the reaction is endothermic.
Pest species.
Nuisance species.
Weeds (In reference to plants)
Harmful non-native species.
Your bronchioles are some of the smallest airways in your lungs. Inhaled air passes through tiny ducts from the bronchioles into elastic air sacs (alveoli). The alveoli are surrounded by the alveolar-capillary membrane, which normally prevents liquid in the capillaries from entering the air sacs.
for self pollination, pollen grains are transferred to the stigma of another plant on the same species while on cross pollination is transferred to the stigma of another plant on a different species of plant.