In a pine forest, there are different species of
birds known as warblers that are able to coexist
on the same pine trees. the cape may warblers
feed on insects located on the tips of the highest
pine branches. the yellow-rumped warblers
feed on insects on lower branches of the same
trees. the different feeding locations for these
two species of warblers indicate that they have
different
(1) niches
(2) ecosystems
(3) methods of asexual reproduction
(4) methods of selective breeding

Astudent observes a star from two positions of earth in its orbit, in summer and winter, and measures the change in the position of the star. which of these can be best calculated by this method?

In german cockroaches, curved wing (cv) is recessive to normal wing (cv+). bill, who is raising cockroaches in his dorm room, finds that the frequency of the gene for curved wings in his cockroach population is 0.6. in his friend joe’s apartment, the frequency of the gene for curved wings is 0.2. one day joe visits bill in his dorm room, and several cockroaches jump out of joe’s hair and join the population in bill’s room. bill estimates that, now, 10% of the cockroaches in his dorm room are individual roaches that jumped out of joe’s hair. what is the new frequency of curved wings among cockroaches in bill’s room? 0.69 0.4 0.5 0.31 0.20

Which of the following can be reduced by the use of renewable energy sources? a. social costs b. economic costs c. environmental costs d. all of the above select the best answer from the choices provided a b c d