Which of the following gymnosperm groups has the most efficient water-conducting cells?
a. Coniferophyta
b. Ginkgophyta
c. Cycadophyta
d. Gnetophyta
e. Pteridophyta.
D
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Most allergy medicines contain antihistamines that block the actions of histamine. These drugs reduce cold symptoms by directly
A. lysing virus-infected cells and preventing further propagation of the pathogen. B. stimulating components of the immune system through the release of cytokines. C. blocking or reducing the inflammation response in mucous membranes. D. stimulating the production of specific antibodies. E. recruiting macrophages to the nasal epithelium.
DNA molecules cannot be altered by chance errors in reproduction
a. True b. False Indicate whether the statement is true or false
Which of the following tissue types is used as the body's reserve of energy?
a. Loose connective b. Blood c. Cartilage d. Dense irregular e. Adipose
What is the last structure that a sperm travels through as it leaves the body?
a. ureter b. urethra c. vas deferens d. ejaculatory duct e. epididymis