Answer:The difficulty in developing vaccines against parasitic diseases is to identify (and produce) appropriate protective antigens because of the lack of complete understanding of the type of immune response required for protection.
Explanation:
I hope this kinda helps.
Answer: D)organisms that possess overall characteristics best suited to their environment
Explanation: organisms that can evolve best suited have a better chance of life for example if put a rat in the arctic it will die to the cold but a paler bear will survive.
Flocculation is the process by which certain chemicals in the soil stabilize large soil aggregates.
false
Answer: Temperature, Wind exposure, Environmental, and light intensity. Hope this helped :)
A dna segment is changed a very good time in the world he answer is a