What is the age of the hypothetical rock layer that these fossils were collected from?

based on the age determined, do you think that this group of fossils could be considered index fossils? why or why not?

suppose that the particular trilobite listed in line 7 of the data table is limited to rocks of lower devonian age and that these trilobite fossils are widespread throughout north america. can this fossils be considered an index fossil? why or why not?

the fossils in this group were collected from limestone and shale rocks. based on what you have learned about the formation of these rock types, what type of environment did these organisms live in?

shale often contains fossils of leaves. if the gastropods listed in line 3 and line 6 were collected from shale containing leaf fossils, could you use radiocarbon dating to assign a numerical date to this rock unit? explain

What does gradualism and punctuated equilibrium have in common

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.

Which material is commonly used as a culture medium for living cells