What occurs when the Northern Hemisphere experiences spring and the Southern Hemisphere experiences fall? A. The Sun is directly overhead in the Northern Hemisphere.
B. The Southern Hemisphere receives more direct rays from the Sun.
C. The Northern and Southern Hemispheres get the same amount of energy from the Sun.
D. The Northern Hemisphere receives more daylight hours than the Southern Hemisphere.

Researchers want to use edna to look for an invasive species in the water which of the steps would be likely do last

Select the correct answer from each drop-down menu. the lac operon in e.coli regulates genes that code for enzymes required for breakdown of lactose. the lac operon is operon that is activated in the presence of .

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.