The species was a keystone species.
Keystone species are the species that ''hold the ecosystem together''.
They have an important role in the trophic networks (food chains) and often they can even afflict changes in the abiotic part of the ecosystem (change the composition of soil, purify the water, lower the effect of the wind etc)
Therefore, when a keystone species is removed it affects greatly the whole ecosystem.
Structure A is used for (4) cell communication. The cell membrance has receptros for cell communcation.
Structure B is used to (1) extract energy from nutrients. The mitochondria is the power house of the cell.
Structure C is used for (1) protein synthesis. The golgi apparatus is where protein is created.
The answer is D.
DNA must be turned into RNA in order to leave the nucleus.
Good luck! :)
<span>Stimulation of muscarinic receptors, a type of ACh receptor located in postganglionic synapses of the parasympathetic nervous system, would cause K+ channels to open, resulting in hyperpolarization of cardiac plasma membranes and a decreased heart rate.</span>
In photosynthetic organisms, NADPH is produced by <span>ferredoxin-NADP+ reductase</span><span> in the last step of the electron chain of the </span>light reactions<span> of </span>photosynthesis<span>. It is used as reducing power for the biosynthetic reactions in the </span>Calvin cycle<span> to assimilate carbon dioxide. It is used to help turn the carbon dioxide into glucose. It is also needed in the reduction of nitrate into ammonia for plant assimilation in </span>nitrogen cycle<span>.
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