The basic unit of macro-evolution is SPECIE.
Macro-evolution refers to the theory of evolution in which changes that occur at or above the level of specie recognizes the need to better understand the patterns and processes which operate at the specie and higher levels within a hierarchical framework. Macro evolution is an evolutionary phenomenon, which can include any of the following: origination of new designs, large scale events such as extinction, broad trend and major transitions.
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The answer is producer because they are at the bottom of the food chain and are the starting point of new energy.
Most
often, antigens are composed of glycoproteins.
<span>An
antigen is a molecule with the possibility to induce an immune response. An
antigen is recognized inside the body by antibodies produced to match an
antigen and to come into contact with it. Antigens can be peptides (amino acid
chains), polysaccharides or lipids.</span>
<span>C. Single events or several causes working together to produce extinction in a short period is referred to as mass extinction.
Example:
</span>Destruction of forests, mountains, and bodies of water to satisfy human needs result to the imbalance of nature which also give rise to global warming.
Animals and plants have lost their habitats. They lost their means to live. They lost their food sources and they suffer and die because of humans irresponsible acts.
hope I helped!!