Purple sea stars are found in the pacific ocean. they prey on common mussels, suppressing the mussel population in the intertidal zone of the pacific northwest. by controlling the mussel population, sea stars enable the ecosystem to support other invertebrates. experimental data suggests that purple sea stars are a keystone species in the intertidal zone of the pacific northwest. what will most likely happen to this ecosystem if the purple sea star is permanently removed? a. invertebrates in the area will undergo rapid speciation. b. vertebrates in the area will assume the role of preying on mussels. c. mussels will dominate the area, causing a net decrease in biodiversity. d. other starfish will migrate to the area and establish themselves in the purple sea star's place.

The image shows embryos of three vertebrate classes

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.

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots