<span>DNA are made up of genes and genes are made up of chromosomes.</span>
<span>Pesticides sprayed on
plants were eaten by small animals, which were later consumed by birds of prey.
The DDT poison harmed both the adult birds and the eggs that they laid. The egg
shells became too thin to with stand the incubation period, and were often
crushed. Eggs that were not crushed during incubation often did not hatch, due
to high levels of DDT and its derivatives.<span> </span></span>
Mycorrhizae are associations formed by fungi that grow on the roots of trees. These fungi penetrate into the roots of the trees. The trees produce energy through photosynthesis and share it with the fungi. The fungi act as decomposers, breaking down dead organic matter to provide nutrients for the trees to grow. The kind of relationship exhibited here is, A. The fungi share a mutualistic association with the trees.
Answer:
C) behavioral isolation
Explanation:
The mechanisms of reproductive isolation that prevent the formation of a zygote by interbreeding between the individuals of two different species are called pre-zygotic isolation mechanisms. Behavioral isolation is one of such pre-zygotic isolation mechanisms. It includes the exchange of specific signals between the individuals of the same species before mating. Such specific courtship behaviors represent behavioral isolation.
Different species of fruit flies exhibit specific courtship behaviors such as fighting and display to attract the females of the same species only. These signals are not identified by females of the other species. It represents behavioral isolation.
Increase in air pollution: public transport
decrease in trees: plant new trees
loss of bird habitat: nesting boxes
endangered aquatic species: regulate recreational activities
