Help y’all If we start with 100 gram of Carbon 14 and 2 half lives pass, how much un-decayed Carbon 14 remain? how many years will have passed for 2 half lives of Carbon 14?

The observations of hooke and van leeuwenhoek documenting the existence of microscopic cells formed the basis of what important theory? a. the cell theory stating that all living things are composed of cellsb. the theory of spontaneous generation, which held that life forms could arise spontaneouslyc. the theory of chemotherapy, or use of antimicrobials to destroy pathogenic organismsd. the germ theory of disease and causative agents

Archaebacteria use for movement. celia flagella pili cell walls

What is it called when part of a cell membrane closes around a molecule to allow the molecule to enter the cell? a. passive transport b. diffusion c. endocytosis d. exocytosisc. endocytosis