What is the main difference between vascular and nonvascular plants?
a)the ability or inability to perform photosynthesis
b)the presence or absence of xylem and phloem
c)the ability or inability to perform cellular respiration
d)the presence or absence of water

Which sentences describe the logistic growth model? there are three different phases of the s-shaped curve. at first, growth is exponential because individuals are few and resources are plenty. this growth model occurs in a situation where resources are plenty and individuals are few to consume the resources. population growth decreases as resources become limited. when a population size reaches the carrying capacity of its environment, the population growth slows down or stops completely. the model looks like a j-curve.