<span>b. photosynthetic organisms provide energy for other organisms on earth.
B is the most suitable answer as photosynthetic organisms get their energy from the sun, and other organisms get their energy from photosynthetic organisms, so the sun is the source of energy for all life.</span>
A radioactive isotope decays at a constant rate proportional to the number of radioactive atoms remaining. A simple way of describing the speed of decay is to see the time it takes for half of the atoms of a radioactive parent to decay and form the daughter element(s). This is called the half life.
Hope this helps
Salutations!
<span>Scientists have arranged all of the different types of material or elements we can find into groups known as what?
</span><span>Scientists have arranged all of the different types of material or elements we can find into groups known as periods. Period is the horizontal row in the periodic table. All of the known elements can be found in the periodic table.
Hope I helped :)</span>
I think this is spyrogyra .
the broken rock layers of mostly solid rock is true