19. CER. A group of students were interested in showing photosynthesis 12 points occurring visually. They decided to use bromothymol blue which is an
indicator that turns green when there is a high concentration of carbon
dioxide and blue when there is a low concentration of carbon dioxide in
water. All the tubes started out blue, but students blew carbon dioxide
into two of the test tubes turning them green. They left one test tube of
each color as their control and put a piece of aquatic plant in the other
two tubes. Then, they put all four of these tubes outside (Monday 7 am).
When the students checked their tubes in the afternoon (Monday 1 pm),
they were so excited to see that tube D had turned blue! Carbon dioxide
was going away and being replaced with oxygen. When the students
checked their experiment early the next morning, tube B and D had both
turned green! Did photosynthesis occur during the experiment? Support
your claim with evidence explain your reasoning. *

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.

How does this experiment explain why it is often milder in areas such as coastal maryland while areas such as kansas or iowa have more extremes in temperature

State officials are considering constructing a road through a forested wilderness area. this action will likely affect the forest ecosystem in various ways. part a: predict how the construction of a road could negatively affect plants and animals in that ecosystem. (3 points) part b: describe one way that the construction of a road could have a positive impact of the forest ecosystem. (1 point)