Which of the following is a blood disorder characterized by crescent-shaped, red blood cells and is caused by a recessive allele that produces an alternate form of hemoglobin?

A. Huntington disease

B. Sickle cell anemia

C. Tay-Sachs

D. Malaria

Why are scientists concerned about the eurasian collared-dove population?

The cuticle is used for a. water conservation. b. protection from predators. c. photosynthesis. d. gas exchange.

54. Where would you most likely find a glacier? Low elevation areas near 20 degrees latitude High elevations and near 60 degrees latitude In the desert Australia

What caused the tree trunks to turn from light to dark in color?

The main difference between a round and a flat character is that a flat character A. is not fully developed. B. has a negative attitude. C. has fewer personality traits. D. is described in more detail.

If a student wanted to separate the colored pigments from a green leaf, the student would likely consider the separation technique of: a. crystallization b. chromatography c. filtering d. distillation

Which of these is an enviromental effect of burning fossil fuels a. tempature increase b. soil erosion c. habbitat succesion d. Flooding

Which of the following is the best example of how factors within a person's environment can influence their personal health? A. eating too much sugar increasing a person's risk of diabetes B. regular exercise decreasing a person's cholesterol C.

What does a prokaryotic cell compare to (daily objects)

In some systems, energy will transform from one form to another. Which of the following is an example of electrical energy bei transformed to both kinetic energy and sound energy? A.) a television showing a movie B.) a tree falling in the woods C.