Birds, like mammals, can regulate their body temperatures within close limits. Therefore birds and mammals are called
A. endothermic.
B. heterothermic.
C. ectothermic.
D. poikilothermic.
Answer: A
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In the plant life cycle, what process takes place
between the formation of gametes and the formation of the zygote?
a. mitosis b. meiosis c. fertilization d. more than one of these e. none of these
Imagine you are a doctor and you are presented with a female patient who has been unable to get pregnant despite 2 years of trying with the same partner. Rank the following factors from most important (#1) to least important (#4) in your determination of the cause of her apparent infertility.____ Her hormone levels____ Her age____ Her STD history____ Her partner's age
What will be an ideal response?
Select the correct order of blood flow through the heart.
a. Pulmonary vein - Right atria - left atria - left ventricle - right ventricle - aorta b. Vena cava - left atria - left ventricle - pulmonary vein - pulmonary artery - right atria - right ventricle -aorta c. Vena cava - right atria - right ventricle - pulmonary artery - pulmonary vein - left atria - left ventricle - aorta d. Pulmonary vein - right atria - left atria - aorta - vena cava - left atria - left ventricle - pulmonary artery
Your friend has just returned from a deep-sea mission and claims to have found a new single-celled life-form. He believes this new life-form may not have descended from the common ancestor that all types of life on Earth share
You are convinced that he must be wrong, and you manage to extract DNA from the cells he has discovered. He says that the mere presence of DNA is not enough to prove the point: his cells might have adopted DNA as a useful molecule quite independently of all other known life-forms. What could you do to provide additional evidence to support your argument?