PLEASE HELP, ANSWER ONLY IF YOU KNOW THE ANSWER, WILL MARK BRAINLEST. What is some biological events

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d.a round-trip ride to school and back

What type of weather does tropical continental air bring in summer? hot and cloudy cool and sunny hot and sunny cool and cloudy

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?