Answer:
heart blood vessels and blood
1. c
2. d
3. a
4.b
Explanation:
I numbered the first four boxes a, b, c, and d, and the slots where they go in 1, 2, 3, and 4 going down.
5.5|1/4
.... ..... ........ .........
it can result in fish kills and restrictions on human consumption it can change the physiology of fish it can cause long-term alterations of aquatic ecosystems
