The endocrine system...
1. affects only the reproductive system
2. releases hormones into the bloodstream
3. competes with the nervous system
4. is made up primarily of glands with ducts

The endocrine system:

releases hormones into the bloodstream

Explanation:

The endocrine system releases hormones into the bloodstream in order to get to the targeted organ

yes

no

blue is scattered more than other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time.