Classify these hypotheses about the ocean as falsifiable or non-falsifiable. Limestone erodes faster than
basalt when exposed to
ocean salt water.
The rugged Panama coastline
offers a wonderful experience
for fishing enthusiasts.
Shallower tide pools support
more algae growth.
Warm ocean water is
more enjoyable to swim
in than cool ocean water.

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.

As the earth formed, the force of gravity increased due to increased mass. what effect did this increased gravity have on the forming planet?