Answer:The Ozone Hole. One billion years ago, early aquatic organisms called blue-green algae began using energy from the Sun to split molecules of H2O and CO2 and recombine them into organic compounds and molecular oxygen (O2). ... As oxygen in the atmosphere increased, CO2 decreased.
Answer:
...make up the <em>atom</em><em>.</em>
2 or more atoms make up a <em>molecule</em><em>. </em>
Molecules form together to make <em> </em><em>organelles</em><em>.</em><em> </em>
...unit of life, <em>the</em><em> </em><em>cell</em><em>.</em><em> </em>
...like cells performing a similar function, <em>tissues</em><em>.</em>
...tissue types together are called <em>organs</em><em>.</em><em> </em>
In <em>systems</em><em>,</em><em> </em>several organs...
A complete single, <em>organism</em><em> </em>represents...
Answer:
E. All of the above
Explanation:
In cardiac contractile cells there is rapid depolarization, then a plateau phase and repolarization.
when an action potential stimulates the cell, voltage-gated channels open quickly commencing the positive-feedback mechanism of depolarization. This in turn raises the membrane potential to approximately +30 mV, and this closes the sodium channels. Next comes the plateau phase, where membrane potential declines relatively slowly due to the opening of the slow Ca2+ channels, allowing Ca2+ to enter the cell while few K+ channels are open, leading to K+ to exit. Once the membrane potential reaches approximately zero, the Ca2+ channels close and K+ channels open, allowing the exit of K+. The repolarization lasts approximately for a while and here is when the membrane potential drops until it reaches resting levels once more and repeats the cycle.
All of them are highly reactive nonmetals
I don’t know how to explain it but this might help