Answer:
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Answer:
500-million-year-old fossil found in BC is ancient ancestor of spiders and scorpions. Palaeontologists in British Columbia have found a fossil of the oldest known ancestor of scorpions and spiders.
Answer: Homeostasis refers to the body’s ability to maintain a stable internal environment.
Explanation: Maintaining homeostasis requires that the body continuously monitors its internal conditions.
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Answer:
1.a, 2.b, 3. c, 4. c, 5. c
Explanation:
1.
4H+O2→2H2O
2.
They must have two or more reactants.
3.
The reaction has more than one product.
4.
S + O2→SO2
5.
2Mg+O2→2MgO
seismic (s) waves are an elastic wave in the earth produced by an earth quake or other means
