Leukemia is a cancer of white blood cells, or leukocytes. when chemotherapy alone is not successful, physicians
sometimes turn to bone marrow transplants.
a bone marrow transplant includes several steps. order these steps for a successful transplant to cure leukemia.

a. donor match located
b. a sample of donor bone marrow containing healthy stem cells is introduced into the patient's bloodstream
c. patient's existing bone marrow and abnormal leukocytes are killed using a combination of chemotherapy and
radiation
d. donor stem cells will migrate to patient's bone marrow and begin producing healthy leukocytes

Dr. kaylan is an ecologist who studies bird behavior. she sets up an experiment to test which type of food crows are most likely to eat when given a choice between walnuts, corn, and sunflower seeds. to perform her experiment, dr. kaylan places three food bins in an area frequented by cows. each bin contains one of the three food types. then, she measures how much of each food type is eaten every day for a month and summarizes the results of her experiment in the pie chart below. based on her results, dr. kaylan concludes that crows choose to eat corn more frequently than other food sources because it has a higher nutritional value. what is a reasonable alternate conclusion that can be drawn from dr. kaylan's data

In pea plants, the allele for inflated pod seed, i, is dominant over the allele for constricted pod seed, i. the punnett square shows a cross for this trait. which offspring will be homozygous dominant

The most famous fossil called archaeopteryx is which of the following? a dinosaur a fern a fish a bird