Carbon dioxide is returned to the atmosphere primarily by the Respiration of animals and plants (the consumers).
Explanation;
Respiration by both plants and animals is an important natural source of carbon dioxide. Carbon dioxide is a by product of the process of respiration, a chemical reaction that plants and animals use to produce energy they need to carry out day to day activities.
Plants and animals use this process to produce energy which is used to fuel normal activities such as growth and movement. The process uses oxygen to break down nutrients and release energy, but also creates water and carbon dioxide as byproducts.
The answer is cornea…..lens. Most bending of light entering
the eye is bent by the cornea. The lens of the other hand adjusts this bending
further, to focus it squarely on the retina. This is why the focal point of the
lens can be adjusted by changing its shape.
The double helix<span> describes the appearance of </span>double<span>-stranded </span>DNA<span>, which is composed of two linear strands that run opposite to each other, or anti-parallel, and twist together. Each </span>DNA<span> strand within the </span>double helix<span> is a long, linear molecule made of smaller units </span>called<span> nucleotides that form a chain.</span>
The answer is differentially permeable or semi-permeable, both are the same meaning. It is usually about cell membrane, and for example osmosis has to occur under this kind of membrane