1) Variation: there needs to be a difference in the individuals within a population
2) Inheritance: These variable traits must be able to be passed down genetically
3) Growth rate: There needs to be a growth rate that requires a struggle for resources
4) Survival rate: There needs to be a difference in survival rate for the different variation types... certain variations will live
Answer:
all of them
Explanation:
because it is all of them
Answer:
They often grow in colonies that carpet the ground. Hornworts are minute nonvascular plants, similar in size to liverworts. They also have very fine rhizoids and lack stems.
Explanation: