Answer:
The correct option is A.
Explanation:
As we know that genetic variation that result from crossing over depend on the number of genes and their alleles. When there are more genes in genome the chances of polymorphic loci will increase, which will result into more genetic variation during crossing over.
Forexample:
Drosophila melanogaster is a common fruit fly having diploid number of 8 chromosome composed of 122,653,977 base pairs, and about ~17,000 genes. Honey bees have diploid number of 32 chromosomes composed of approximately 2360000 base pairs, and 10,000 genes.
Conclusion:
As fruit fly genome contain more genes and polymorphic loci, so genetic variation is more likely to be greater in fruit fly.
C is the answer because these accessory pigments on mass by the chlorophyll, which is responsible for producing food for the tree
D .............. im pretty sure its this one :)
Answer: The field is experiencing <em><u>Secondary succession.</u></em>
Explanation:
Ecological communities change slowly over time. While <em>primary succession</em> is initiated by pioneer species in areas that haven't previously been colonized; secondary succession always follows other communities. <em>Secondary succession</em> follows major disruptions in communities like fires, storms, flooding and even human disturbance.
The field becoming overgrown is typical of secondary succession. After years of disuse, the field is being occupied by species more <em>capable</em> of thriving in changed conditions. The community may be on its way to becoming a stable climax community if no further disruptions occur.
