The accessory organs of the skin are located in the dermis. What value does the dermal layer provide to the accessory organs? A) The dermis is the basal layer where new cells form and push the old cells out.
B) The dermis is composed of fat cells and keeps our hands and feet warm.
C) The dermis acts as a natural sunscreen, protecting us, to some extent, from ultraviolet rays.
D) The dermis is full of nerves and provides the organs with a blood supply.

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?

You will create a molecular clock model for an arthropod gene. follow these guidelines to make your model: . your timeline will span from 90 million years ago to the present. the common ancestor in your model is an arthropod that lived 90 million years ago. the gene that you'll track codes for a protein in the species venom . the dna sequence youll track contains 10 nitrogen bases. you can choose the order of the bases and where the mutations occur. this gene mutates at a rate of approximately 0.76 base pairs every 17.1 million years. to build your model,/ calculate the estimated time period it takes for 1 base pair to mutate. the first time period will only show the common ancestor. at the beginning of the second time period, three lineages will diverge from the common ancestor, each with a different mutation in their gene sequences. the first and third descendant species will survive for the rest of the timeline. the second descendant species was extinct 50 million years ago. calculate how long it will take for one full base pair mutation to occur. explain your reasoning by constructing a mathematical equation

Explain how mendel kept his pea plant from self pollination