The graph illustrates the frequencies of two genotypes, aa and aa, over many generations. the recessive condition, aa, results in sickle cell anemia. wince this is a recessive condition, individuals with aa or aa do not display the sickle cell phenotype. what statement explains what is shown in the graph beyond generation 35 for this gene? a) individuals with the heterozygous condition replaced individuals with either homozygous condition. b) all of the individuals with aa phenotype died, leaving only individuals displaying the dominant phenotype. c) females preferred mating with aa individuals, resulting in a continued presence of the recessive (a) allele. d) the population reached equilibrium for this trait, as the genotype frequencies stabilized after 35 generations.

Parasitism could be considered a form of which of these types of relationships? -mutualism -commensalism -predator-prey -mimicry

On a recent expedition to a remote region of northern canada, scientists uncovered skeletal remains from about 100,000 years ago. surprisingly, all the skeletal remains, which included many species from differing biological families and spanned about two thousand years, showed evidence of experiencing temperatures in excess of 1000 degrees fahrenheit (or 538 degrees celsius). which of the following, if true, best explains the apparent paradox between the cold environment and the evidence of the bones experiencing hot temperatures? (a) chemical changes that naturally occur during the process of decay in only one north canadian species produce the same evidence of the species' skeletons being exposed to hot temperatures as the expedition scientists found. (b) a little over 103,000 years ago, a large fire is known to have occurred in northern canada. (c) strong evidence exists that as early as 70,000 years ago, homo sapiens around the world relied heavily on fire to cook animals. (d) in the same expedition and in roughly the same layer of excavation, scientists found rudimentary wood cutting and hunting tools used by early humans.

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity