Rigid skeletons are formed from materials including chitin (in arthropods), calcium compounds such as calcium carbonate (in stony corals and mollusks) and silicate (for diatoms and radiolarians).
The answer is A. Fertilizer
The other answer choices don't make sense Herbicide is a poison that kills plants, Pesticide is an insect killer, while a Growth Hormone is designed to help the plant grow not to put nutrients into the soil.
To convert 0.0701 kilograms to milligrams, we must first figure out how many milligrams are in 1 kilogram.
1 kg (kilograms) = 1,000,000 mg (milligrams).
Since we have 0.0701 kg, we need to multiply 1,000,000 by 0.0701.
1,000,000 x 0.0701 = 70,100.
There are 70,100 mg in 0.0701 kg.
I hope this helps!
