I don't like to leave comments that aren't the answer, but I think you should provide a bit more context like, perhaps, a list of activities or the name of an organism.
Answer:
In AB blood, the A and the B alleles have?
Explanation:
They have codominance.
I believe an ecosystem is a collection of all of the abiotic and biotic factors in an entire region.
The average speed of an object is defined as the distance traveled divided by the time elapsed. Velocity is a vector quantity, and average velocity can be defined as the displacement divided by the time.
