Which statement best describes the difference between a gene and an allele?
a.
a section of dna that usually contains the code for a specific protein that determines a specific trait is a gene, while an allele is a section of a gene.
b.
a section of a chromosome that usually contains the code for a particular protein is an allele. a gene is one of two or more variations of an allele.
c.
a section of dna that usually contains the code for a specific protein that determines a specific trait is an allele, while a gene is a section of an allele.
d. a section of a chromosome that usually contains the code for a particular protein is a gene. an allele is one of two or more variations of a gene.

Is D.

A section of a chromosome that usually contains the code for a particular protein is a gene.

An allele is one of two or more variations of a gene.  This makes a phisycall characteristic eather dominant or recesive, depending of the presence of one or another

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.