In a flock of birds one individual first gives a call when a predator appears. this call is quickly repeated by all members of the flock and soon the entire flock is calling at this predator. this activity seems to deter the predator. when this barrage of calls is given the predator always flies away. this is a possible example of

Alaska and northern canada have a diet rich in vitamin d and their skin color is darker than predicted on the basis of iv intensity at their latitude. explain the observation:

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

Agroup of plant cells was exposed to radiation, which damaged the chloroplasts and caused them to lose function. if the mitochondria were unharmed, what would happen to the overall function of the plant cells? a. the cells would not be able to make food, but would be able to release energy from biomolecules. b. the cells would not be able to replicate dna, but would be able to break down waste. c. the cells would not be able to break down waste, but would be able to replicate dna. d. the cells would not be able to release energy from biomolecules, but would be able to make food.