Answer:
living, nonliving
Explanation:
all living and non living things in an area make up an ecosystem
The answers is D because it needs something to survive
Answer:
organ system it belongs to the sensory system.
the level of organization go from
•cells
•tissues
•organs
•organ systems
•organisms
•population
•community
•ecosystem
•biome
•biosphere
Because an antibody is "made" relative to the antigen, but kept at low levels when you are exposed the first time ("primary immune response"). The second time you're exposed to the same antigen, memory cells recognize it and the body produces a high level of antibodies, and the level of antibodies usually remains higher for a longer time ("secondary immune response"). This is your basic immune response (primary and secondary).
This explains exactly why vaccines are effective to extremely effective.
the same goes for the other
