Answer:
<h3>MEE TOO I DONT UNDERSTAND THIS QUESTION!☡</h3>
Don't take my full word on it, but I'm pretty sure 4 is D).
Answer:
a. lack of running water
Explanation:
The Tippy tap technology was invented to solve the issue of running water problem. This technology is designed mainly for hand washing and it is used in the rural area to solve the running water problem.
This technology technique needs only forty milliliters of water; it is less expensive and reduces the chance of transmitting diseases as the user only touches a bar of soap suspended by a string.
Coral provide the place for algae to grow on. Algae attract microorganisms for coral to feed from.