Which statement about conifers such as the spruce tree is most accurate?
A) Male conifers produce cones while female trees produce flowers.
B) They are the largest seedless vascular plants.
C) They comprise about three-fourths of all gymnosperm species.
D) They are rare, fruit-bearing gymnosperms.
E) They comprise a small percentage of angiosperm species.
Answer: C
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Which of the following is/are the most common cause of pharyngitis?
A) Escherichia coli B) Staphylococcus aureus C) Streptococcus pyogenes D) viruses
Specific proteins produced by cells of the immune system in response to the presence of foreign molecules that circulate in the serum and are present in secretions such as saliva are called:
a. antigens. b. immunoglobulins. c. cytokines. d. phagogens.
Gymnosperms are the most ecologically diverse plants on Earth
a. True b. False
Which types of cells in the human body do not repair themselves if they have been damaged?
a. Skin b. Bone c. Blood d. Hair e. Nerve