Phosphate and sugar I think is what makes them up .
The best and most correct answer among the choices provided by the question is the fourth choice "<span>Crossing over during metaphase allows segments of DNA from 2 parents to SWAP and produce non-identical haploid cells."</span><span>
</span>Mutations are changes in the DNA. A single mutation can have a large effect, but in many cases, evolutionary change is based on the accumulation of many mutations. Gene<span> flow is any movement of </span>genes<span> from one population to another and is an important source of</span>genetic variation<span>.</span>
I hope my answer has come to your help. God bless and have a nice day ahead!
Answer:
Explanation:
A typical leaf has three main layers. ... Some arid-climate plants are able to conserve water because of their reduced leaf size. Less leaf surface area results in reduced water loss through the epidermis. Small leaves have fewer stomata than larger leaves, and that adaptation also reduces water los