Answer:
20 different kinds of minerals make up 95% of earth's rocks.
<u><em> I hope this helps... please correct me if i'm wrong</em></u>
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Answer:
The volume of feedstock needed to mantain an organic load rate of 2 kgVS/day is 0.055 m3/day of feedstock.
The HRT is 20.6 days.
Explanation:
First, we calculate how many kg is 1 m3 of feedstock. We know the density, so we can calculate the mass:

If the VS are 6% in weight,

The volume per day needed to feed 2 kg of VS/day is:

The HRT depends on the volume of the tank and the flow. Its equation is

1.05 x 10 to the 21 power formula units of lead (IV) phosphate
Answer: Dichotomous
Using a Dichotomous Key to Identify Organisms
A dichotomous key is a tool used by biologists to identify organisms in a group through a process of answering yes or no questions about the organism. Dichotomous means 'divided into two parts', as each question about an organism has two choices.