Answer: A. combustion
Explanation: During complete combustion, carbon and hydrogen react with oxygen (O2) to produce carbon-dioxide (CO2) and water (H2O). The carbon-dioxide produced is released into atmosphere and is utilized for carbon fixation and recycling.
Answer:
This statement is false.
Explanation:
Producers (namely mosses and liches) are the first organisms to reenter an ecosystem and are known as "pioneer species". They are proceeded by (in this order) small plants, shrubs, bushes, and climax communities (i.e. large trees). Only then do consumers once again become part of the ecosystem. For all of these reasons, the statement presented in this question is false.
<span>The organs that participate in vitamin D synthesis and activation are kidneys and liver.
</span>Vitamin D<span> is carried in the bloodstream to the </span>liver, where it is converted into the prohormone calcifediol.<span>Calcifediol is further hydroxylated by the kidneys to form </span>calcitriol and c<span>alcitriol circulates as a hormone in the blood, and regulates the concentration of </span>calcium<span> and </span>phosphate.
Long strands of double-helical DNA fit into the nucleus of a single cheek cell, the double helix is packaged and wrapped around proteins, folded back onto itself and coiled into a compact chromosome. 4.
Addition polymerisation???
