Answer:
Periodization can mean..
Explanation:
the process of categorizing the past into sections or periods of time. This is usually done in order to categorize and make it easier to talk about a specific time period.
Answer:
1) circulatory and respiratory
2) endocrine
3) circulatory
4) circulatory and nerves
Explanation:
I think these are right. Sorry if they are not.
Explanation:
our chemical barriers protect almost every infection we can get in our body