T cells are activated by macrophages and activated B cells, which fulfill this role by acting as ________
Fill in the blank(s) with correct word
antigen-presenting cells (APCs)
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Connective tissue serves to support and bind other tissues. Which of the following is NOT an example of connective tissue?
A. Bone B. Cartilage C. Neurons D. Fat E. Blood
Which type of plant hormone causes chloroplasts to mature?
a. cytokinins b. salicylic acid c. abscisic acid d. ethylene e. gibberellins
Form refers to ________, and function refers to ________
A) anatomical structure; physiological actions B) anatomical structure; environmental actions C) physiological actions; anatomical structure D) physiological actions; environmental actions
The tropics are known to have greater species diversity than the temperate zones.Which explanation for this phenomenon is the least convincing?
A. Niches are narrower in the tropics. B. Fewer predators in the tropics allow more prey species to flourish. C. Seasonal variability is less in the tropics. D. Greater spatial heterogeneity in the tropics creates more niches. E. The tropics have greater plant production, which supports greater overall species richness.