If 50% of a radioactive element remains after 4000 years, what is its half life

What will happen to a population of predators if there is a sudden, temporary increase in the number of prey? a. the population of predators will be uniform with no change. b. the population of predators will increase first and then decrease slowly. c. the population of predators will increase continuously.

Archaebacteria use for movement. celia flagella pili cell walls

Which statement best compares aerobic and anaerobic respiration