A portal of entry<span> is the site through which micro-organisms enter the susceptible host and cause disease/infection. Infectious agents enter the body through various </span>portals<span>, including the mucous membranes, the skin, the respiratory and the gastrointestinal tracts.</span>
Answer:
red
Explanation:
Visible light may be a tiny part of the electromagnetic spectrum, but there are still many variations of wavelengths. We see these variations as colors. On one end of the spectrum is red light, with the longest wavelength. Blue or violet light has the shortest wavelength.
Answer:
Isaac Newton
Explanation:
Isaac Newton discovered that white light is a spectrum of seven colour rays.
<span>Natural wetlands are flat and often have deep, nutrient rich soil with an abundant water supply. These conditions are ideal to agriculture</span>
