Read each of these scenarios describing the evolution of decreased body hair in humans. Scenario X: As hominins migrated to more open environments and became mid-day hunters/scavengers, they were exposed to higher levels of heat. In order to effectively cool the body, hominins needed to have less hair, so a mutation for decreased body hair occurred. Eventually, evolution favored those with less body hair such that all hominins had less body hair. Scenario Y: As hominins migrated to more open environments and became mid-day hunters/scavengers, they were exposed to higher levels of heat. Hominins with less dense hair, a trait that had heritable variation within the population, maintained a cooler body temperature and were more successful in obtaining food. Over time, hominin populations evolved to have less body hair. Scenario describes evolution by natural selection. I know this because. Group of answer choices X; mutation occurs that increases survival of the species X; it describes evolution of individuals who became adapted to the environment. Y; it involves heritable variation and fitness Y; hominins acquired a needed characteristic so that they were more successful hunters.

In a hypothetical breed of dogs, coat color is controlled by two genes. there are six different coat colors in this breed: black, brown, cream, gray, silver, and tan. consider the following crosses. cross 1: black females from a lineage of all black dogs are crossed with brown males from a lineage of all brown dogs. f1 males and females are all black. when f1 are intercrossed, f2 males and females are black or brown. cross 2: black females from a lineage of all black dogs are crossed with tan males from a lineage where all males are tan and all females are cream. f1 males are black, f1 females are gray. when f1 are intercrossed, f2 males and females are black, brown, gray, or tan. cross 3: silver females from a lineage where all females are silver and all males are gray are crossed with brown males from a lineage of all brown dogs. f1 males and females are all gray. when f1 are intercrossed, f2 males are black, brown, gray, or tan, f2 females are cream, gray, silver, or tan. select the correct statements regarding the mode of inheritance of the coat color genes. a) both genes are x-linked. b) both genes are autosomal. c) one of the genes modifies the expression of the other gene. d) each gene has an additive effect on the intensity of coat color. e) each gene independently specifies three colors. f) one of the genes is autosomal, and the other is x-linked.

Amarine ecologist has constructed the conceptual model shown in the diagram. what predictions can be made from using this model? where the tertiary consumers get their energy how often primary producers are able to reproduce when bacteria and fungi initiate the process of decomposition whether other secondary consumers are present

The same agricultural practices are used in every country of the world. select the best answer from the choices provided t f