Only a small percentage of the energy produced by the sun is actually used by living organisms. What percentage of energy produced by the sun is captured by photosynthetic organisms


%0.03

Biology & Microbiology

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What factor is believed to be a contributing factor to the decline of insect populations? a. Development of natural areas

b. Use of pesticides. c. Spread of newly introduced diseases. d. All of these choices. e. Insect populations are not declining.

Biology & Microbiology

What evidence do we have for the development of photosynthetic cells that used water as an electron

source at least 3 billion years ago?

a. fossils of the first eukaryotic cells b. the discovery of the first plant fossils c. the discovery of stromatolites d. fossils of the first animals e. fossils of the earliest chloroplasts

Biology & Microbiology

In which condition are both alleles expressed in the heterozygous phenotype?

A) complete dominance B) codominance C) pleiotropy D) epistasis

Biology & Microbiology

Which of the following cancer treatments is LEAST likely to kill healthy cells?

a. chemotherapy b. radiation c. surgery d. All of the above carry the same risks.

Biology & Microbiology