Answer: D. Extinctions occur at higher rates during times of ecological stress when populations and species are poorly adapted.
The dissolved oxygen content in water
Sexual intercourse. The developing of the female egg cells and the production of sperm cells
<span>The gene sequence containing an operator, promoter and repressor is known as an operon. These genes are called as structural genes. the operon is regulated by the presence/absence of the inducer such as glucose/lactose. It may also be a constitutive operon, which works all the time.</span>
