It created an opportunity for the mammals to become dominant on earth by wiping out the dinosaurs.
One factor is resting and exercising
stress and peace
<span>The best place would be far away from a cliff and the worst would be right on top of a cliff or some sort of land such as a beach or directly beneath it. At anytime, gravity will cause mass wasting, in other words the rock and soil will just break apart.</span>
Food webs normally start at the bottom and work their way up. Like the plants will be at the bottom, and then each level shows the animals getting bigger while losing energy. You continually lose energy as you work your way up an ecosystem, so normally there are only three or four levels. I hope this helps!
Answer: Option B
Explanation: The first line of defense acts a barrier and does not allows the foreign materials to enter inside the body. It includes chemical and physical barriers that are always ready to protect the body from infection.
Example: Skin and mucous membrane.
Skin is largest organ and it acts as a barrier between pathogens and human body. It acts a waterproof material and the pathogens cannot get inside through skin unless the skin is broken.
Mucous membranes also acts as first line of defense and breaks the cell wall of many bacteria entering through the openings of the body.
So, skin and mucous membrane are the first line of defense.
