Spirogyra are green algae that can reproduce sexually. Which of the following is true only of a sexually-reproducing organism such as Spirogyra?
a. The cells of parent algae have nuclei.
b. Each offspring contains chloroplasts.
c. Several offspring may be produced at once.
d. Genetic material is contributed by two parent cells.

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

2. how does the miller-urey experiment fall short of demonstrating that life can arise from inorganic molecules? explain. a. it doesn't show a leap between a collection of amino acids and a single-celled organism. b. it recreates the conditions that existed at the earth's beginning, but no molecules form as a result. c. it doesn't provide evidence of the formation of amino acids. d. it doesn't show how multicellular organisms developed from unicellular organisms

Anton created a chart listing different types of materials. which best complete the chart?