What does a food chain diagram illustrate ?
a. an ecosystem's carbon cycle
b. an ecosystem's water cycle
c. one pathway of feeding in an ecosystem
d. multiple pathways of feeding in an ecosystem

In which way does nicotine cause addiction? by stimulating the brain's pleasure center by increasing blood-sugar levels by decreasing dopamine levels by reducing depression and anxiety

How does social isolation affect teens?

Which of the following processes within viral replication is the greatest source of genetic variation in rna virus populations? a) high mutation rate due to lack of proofreading of rna genome replication errors.b) transcription from the host cell rna polymerase introduces numerous mutations.c) capsid proteins from the host cell can replace the viral capsid.d) viral rna is translated by host cell ribosomes.