Which of the following are primary lymphoid organs?

a. bone marrow and thymus

b. appendix and spleen

c. lymph nodes and tonsils

d. spleen and thymus

Where solubility can be observed?

A flea may live on the skin of a dog and feed on the dog's blood. Which of the following is true about this relationship between the flea and the dog?

A phylogenetic tree a. indicates common ancestors for each family. b. uses only derived characters. c. includes the organism's order and class. d. indicates common ancestors. e. indicates the organism's taxon.

Is there any medical student that wants to communicate?

Autotrophs differ from heterotrophs in that only autotrophs (1) require carbon dioxide for cellular respiration (2) release oxygen as a product of cellular respiration (3) synthesize nutrients using carbon dioxide and water (4) break down sugars to

The power was off last night, and the yeast cultures in your incubator cooled down from 25 degrees to 20 degrees centigrade in temperature. to your great relief, you find that the yeast cells did not die.

Which of the following is a way that human modification of limiting factors causes unbalance in ecosystems? a. habitat loss b. pollution c. climate changes d. all of the above

What form is carbon in the atmosphere?

Both sneezing and coughing are examples of protective reflexes triggered by irritation. sneezing and coughing both involve a disruption in respiration. what is the formal name for the period when respiration is suspended

The type of liquid is the