A living cytoplasmic connection penetrate the walls between sieve tube elements and their companion cells; which are often complex and branched on the companion cell side, known as

TLS Online TPP Program

#Question id: 12114

#Unit 10. Ecological Principles

Researchers have found that a region of the canary forebrain shrinks during the nonbreeding season and enlarges when breeding season begins. This annual enlargement of brain tissue is probably associated with the annual

TLS Online TPP Program

#Question id: 12115

#Unit 10. Ecological Principles

Although many  chimpanzee populations  live  in  environments containing oil  palm  nuts,  members of  only  a  few populations use stones to crack open the nuts. The most likely explanation for this behavioural difference between populations is that

TLS Online TPP Program

#Question id: 12116

#Unit 10. Ecological Principles

Which of the following is not required for a behavioural trait to evolve by natural selection? 

TLS Online TPP Program

#Question id: 12117

#Unit 10. Ecological Principles

Female spotted sandpipers aggressively court males and, after mating, leave the clutch of young for the male to incubate. This sequence may be repeated several times with different males until no available males remain, forcing the female to incubate her last clutch. Which of the following terms best describes this behavior?

TLS Online TPP Program

#Question id: 12118

#Unit 10. Ecological Principles

According to Hamilton’s rule,

TLS Online TPP Program

#Question id: 12119

#Unit 10. Ecological Principles

How  does inefficient transfer of energy among trophic  levels result in  the typically  high  endangerment status of many top predators?