The body's ability to mobilize the cellular memory of an attack by a pathogen to throw off subsequent attacks is called

Which one of these is a involving in both sexual and asexual reproduction

Johnny rode his bike 4 blicks down the street to his friend's house once he got to his friend house and realized he could not cone out to play he turned aroubd and went back home.what is displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic