<span>Having things other than chlorophyll (or bacteriochlorophyll or bacteriorhodopsin) absorbing the light will decrease productivity in any ecosystem whose biotic basis is photoautotrophs.</span>
The answer is A, a mountain building.
The two faces of the book represent the tectonic plates
As he presses them towards each other he is modeling a convergent boundary, and mountains are an affect of convergent plates.
Isotopes are variants of a particular chemical element which differ in neutron number (neutral particle)and all isotopes of a given element have the same number of protons (positive particle) in each atom.So isotope B of the sodium will have 11 protons, 11 electrons but it may have a wide range in its number of neutrons.
Such plants are called vascular plants.
