The circulatory system of mammals has a ________ chambered heart.a. two
b. three
c. four
d. one

Which statement best describes a human influence on the biogeochemical cycles?increased eutrophication caused by high levels of nitrogen and phosphorousincreased nitrates available due to inaccurate methods of denitrificationincreased global warming due to alternative energy sources
increased amount of water that is available to freshwater ecosystems

CANT GET WRONG , ITS LIKE A WORK BANK BUT DONT KNOW WHAT ITS CALLED.In any family, the children may or may not look like their parents. They may or may not look like their siblings. That's because each one of us inherit half of our chromosomes from our mother and half from our father. What assortment of we get varies from child to child. Our chromosomes contain many genes, and each gene codes for a specific trait. The traits people see, like eye color hair color, or height, also depend on whether the gene is dominant or recessive. In this family, brown hair is dominant over red hair. It is very possible that these two parents could only have children with brown hair! It is also possible that their children all have red hair! Why? First, to inherit a recessive trait like red hair, you must have two genes for red hair color. Because one parent, the mother, has red hair we know the mother must have two genes for red hair. The father has brown hair. We know he must have at least one gene for brown hair but he also has one gene for red hair. What two genes will their children have? It's a matter of probability. Each child has a 100% chance of inheriting the red hair gene from their mother and a 50% chance of inheriting the red hair gene from dad. That means, all the children will have at least one gene for red hair!

1.Where do our chromosomes come from? (Twelve word phrase)
2.What codes for each specific trait? (One word)
3.In this family, what is the dominant hair color? (Two words)
4.In this family, each child has a _______ chance of inheriting one gene for red hair. (Percentage)
5.What combination of genes you receive from your parents is a matter of ______________. (One word)

What characteristic is shared by birds, salamanders, and sharks?a. Lungs
b. Jaws and paired appendages
c. Four limbs
d. Endothermy

What is the role of RNA polymerase?

Choose all the answers that apply. Which of the following minerals can be scratched with a fingernail? -talc
-diamond
-topaz
-quartz

Juan’s family has a history of sickle cell disease. His father died of sickle cell disease complications when Juan was six years old. He remembers his father being in great pain. Juan marries Gina. Gina’s maternal grandmother and paternal grandfather had sickle cell disease, but neither of her parents has the disease. Juan does not want to have children because he is convinced they will have sickle cell disease. Gina is not so sure. They have come to you for advice about having whether or not to have children. Based on your calculations of the probability of their child getting sickle cell disease, what is your advice? Show your calculations and explain your reasoning for your response. It may be helpful for you to draw pedigrees and possible Punnett squares for both Juan and Gina’s families