According to the 2011 Earth Science Reference Table, Selenite Gypsum has an approximate hardness of 2.
The hardness of calcite is 3.
The hardness of apatite is 5 according to the Moh's hardness scale.
The hardness of diamond is 10.
A semipermeable membrane is any biological or synthetic membrane that allows certain molecules or ions to pass through while restricting others.
I think it the answer is C ( The relationship between the bacteria and the ticks is commensalism, and the relationship between ticks and humans is parasitism.
-- Alina (:
Answer:
It is the sun in most ecosystems as the light energy is fixed during photosynthesis and then transferred to other organisms via the food chain.
Explanation:
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