If this particular antigen attempts to re-infect caleb, it’s in for a bigger fight. by getting activation of adaptive immune cells such as b-cells and t-cells, the body generates an extra layer of protection. what is a critical advantage for caleb the next time he encounters this antigen?

What part of the brain is highlighted in the diagram below?

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.