<h2>Answer:</h2><h2 /><h2>DNA molecules are a precursor to self-replicating RNA molecules, which are used to build proteins. Early RNA molecules were able to self-replicate, which helps to explain why all organisms share the same genetic code.</h2>
<span>When you talk about growth, it refers to
development either in size, state or ability, the capacity. Growth in living
organisms are resulted from acquiring nutrients, being able to function in
adaptation, irritability, reproduction and excretion. On contrary, these functions
are absent in nonliving things. When you say growth in nonliving things it’s
either by addition of matter or magnitude. The process is called accretion but
this doesn’t mean maturation or aging in living organisms. Maybe rusting or
oxidation is caused by the chemical change, toxification but not growth just chemical
reaction. </span>
A plant reaches its adult stage
when it is ready to reproduce.
The statement “All plants
reproduce several times before dying” is true. The answer is letter A. Plants
can reproduce several times as long as it has the gametes needed for
reproduction.
20.4 21.3 are the correct answers
