Keystone species are species
whose roles have a large effect on the types and abundance of other species in
an ecosystem. Keystone species are important in the ecosystem as they help to
determine the whole ecosystem and without them, the ecosystem would be different
or stop to be in existence. Almost all animals that have a significant impact
on the food webs are examples of keystone species.
Its volume increases more than its surface area.
Answer:
The correct answer to the question: During inhalation, which changes first in the thoracic cavity, the pressure or the volume, is, the volume.
Explanation:
The process of breathing, that is the cylces of inhalation and inspiration, are completely dependent on pressure gradients both on the atmosphere and inside the body, specifically the lungs and thoracic cavity. Before the breathing is initiated, both the atmospheric and alveolar pressures (alveoli are where the exchange of oxygen and carbon dioxide will take place), is equal. However, during the initiation of inspiration, the costal muscles and the diaphragm descend and open up the chest cavity, pulling with them the lungs. This causes an increase in volume capacity and a decrease of pressure within the alveoli. Since gases like oxygen tend to move from higher to lower pressure gradients, as the volume of the lungs increases, and pressure decreases, oxygen will flow from the atmosphere into the lungs. During expiration, as the lungs return to their normal state, volume diminishes, pressure increase, and the gases are thus expelled to normalize pressures again.
Answer:A) it made it possible to ship goods worldwide
Explanation:
The right option is c. usually is caused by consuming
improperly home-canned food.
Botulism is a severe food borne illness
caused by the bacteria clostridium botulinum. This illness is caused by eating foods
contaminated with the bacteria or its toxin. Ingestion of foods that are not canned
properly at home is the major cause. Symptoms of botulism generally appear 12
to 72 hours after eating contaminated food.
