How can this be explained using natural selection

Once you have been exposed to an antigen, you develop immunity against the same antigen because

What is one example of an index fossil?

Put the steps of endochondral ossification in the correct order. 1: formation of medullary cavity and appearance of secondary ossification centers 2: cavitation of hyaline cartilage within the cartilage model 3: invasion of internal cavities by

Describe is Anaphase?

What would happen if there were no predators in the forest. would the colors of the moths change over time? defend your answer?

What would happen to the population of an animal if its natural predator was removed from the food web? A) It would decrease B) It would stay the same C) it would increase D) It would fluctuate

Ali wants to buy a piano. The piano measures 19/4 feet long. She has a space 5 feet long for the piano in her house. Does she have enough room? Draw a number line to show, and explain your answer.

Boyle's law states that, as the pressure of a gas increases, the volume decreases True or False?

Which type of engineer would most likely be responsible for finding new veins of coal? petroleum engineer geophysical engineer water resources engineer solar energy engineer

Why is it important for dna replication to be error free