Answer:
Petroleum
Explanation:
Like all fossil fuels, petroleum is a nonrenewable energy resource. This means that it is a resource that cannot be replaced as quickly as humans use up existing supplies. Humans face a problem because once petroleum reserves begin to run out, there won't be enough fuel to power all the automobiles in the world.
Answer:
genotype, phenotype
Explanation:
The genotype is the individual's collection of genes, is a unique version of DNA sequence. Phenotype is the expression of these genes, they are the observable characteristics an individual presents and it can be influenced by many factors such as environment, diet, etc.
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Answer:
Participation.
Explanation:
Both are moving downwards. Participation falls from the sky.
