Why is it important that farmers plant crops during the winter that improve the levels of nitrogen in the soil? a. these crops can fix nitrogen into usable nitrates. b. these crops have root nodules that contain bacteria. c. these crops produce fruit that quickly decomposes into usable nitrogen. d. these crops all use nitrogen in their specialized photosynthesis process.

Plz plz plz quick! 49 points for whoever which of the following statements about greenhouse effect is true? *life on earth is suffering because of greenhouse effect *the greenhouse effect is caused by human activity *all greenhouse gases are harmful *life on earth would not exist without the greenhouse effect

Are the earth's ocean floor and continents the same age geologically? why or why not?

14) whenever diploid populations are in hardy-weinberg equilibrium at a particular locus a) the allele's frequency should not change from one generation to the next, but its representation in homozygous and heterozygous genotypes may change. b) natural selection, gene flow, and genetic drift are acting equally to change an allele's frequency. c) this means that, at this locus, two alleles are present in equal proportions. d) the population itself is not evolving, but individuals within the population may be evolving.