Answer:
B. Major types of fossil fuels: coal, oil and natural gas
Explanation:
Algae and nitrogen-fixing bacteria are photosynthetic organisms.
Unconditional positive regard is a Rogerian term for: Positive behavior toward a person without attaching any contingencies.
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I believe the answer is incomplete dominance. Incomplete dominance creates a mix of the two phenotype(white and dark purple flowers) to create a third phenotype (lavender). Lavender is a mix.
Whereas, co-dominance would not be a mix but both traits would exist within the organism. In your question, it would be codominance if the dark purple flower and the white flower created a flower with white and dark flower pedals. This would not be a mix of the phenotype, but a co-existance of both phenotype.
I hope that helps! :D