1. <span>composed of cells with cell walls
2. </span><span>Vertebrates contain a backbone, while invertebrates do not.</span>
What Leila should know about female orgasms is that MOST WOMEN DO NOT ROUTINELY HAVE ORGASMS THROUGH INTERCOURSE.
Several research study have shown that compared with men, women are significantly less likely to have orgasm. Four specific factors had been pin pointed has been responsible for this. They are demographics, beliefs, relationships and sexual trauma.<span />
Mantle convection causes tectonic plates to move around the Earth's surface.
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.
