C prepcepataion that’s the right answer
1. Testing only one variable
A controlled variable means its the one that stays the same. In a controlled experiment, it means there is only one manipulated, (changed) variable.
Answer:
Masks are a simple barrier to help prevent your respiratory droplets from reaching others. Studies show that masks reduce the spray of droplets when worn over the nose and mouth.
Explanation:
Answer:
Eggs are developed and released by the <em>ovaries.</em>
Sperm is produced by the <em>testes</em>.
Explanation:
Ovaries are the site in females where the production of egg takes place. After the formation of an egg, the egg is transported to the fallopian tube, where it might undergo fertilization if a sperm unites with it.
Sperms are the male reproductive cells which are produced by many animals. The sperms are produced in the testes of males.
The sperm and the egg unite to form a fertilized zygote.
the correct answer is in fact D- groundwater adds water to lakes, rivers, and oceans :)
