It IS NOT A because after a fire, soil remains, so it would be secondary, not primary. D is INCORRECT because after a volcano, only rock is left so it is primary succession, not secondary.
If you can post the picture I could tell you the correct answer.
There are 4 fundamental states of matter: solid, liquid, gas and plasma. Energy is the ability to cause change or do work. Some forms of energy include light, heat, chemical, nuclear, electrical energy and mechanical energy.
D) crocodiles eating a buffalo... this is because the crocodile is a cold blooded animal therefore it doesn’t have to use the energy to maintain its body temperature.
Let's go through each of our options.
For A, the rarity of something has no effect on its validity.
For B, the study wouldn't be more valid, as you should only be testing one variable at a time (in the case, the medicine).
For C, nothing in your experiments should ever be random. And if I'm correctly interpreting it, the question means that even patients who aren't sick would be receiving the treatment, which serves no purpose at all.
Therefore, we know that D must be the correct answer, via process of elimination. Smaller sample sizes are not ideal for experiments, as they require a great deal of extrapolation to see more specific results on a larger scale.
Answer:
Biology is the science that studies life, but what exactly is life? This may sound like a silly question with an obvious response, but it is not always easy to define life. For example, a branch of biology called virology studies viruses, which exhibit some of the characteristics of living entities but lack others. It turns out that although viruses can attack living organisms, cause diseases, and even reproduce, they do not meet the criteria that biologists use to define life. Consequently, virologists are not biologists, strictly speaking. Similarly, some biologists study the early molecular evolution that gave rise to life; since the events that preceded life are not biological events, these scientists are also excluded from biology in the strict sense of the term.
Explanation:
