Both plants and bacteria use _____________ to produce ____________
Fill in the blank(s) with the appropriate word(s).
Ans: fixed nitrogen / amino acids and other macromolecules
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Connective tissues typically have _____
A) little space between the membranes of adjacent cells B) the ability to transmit electrochemical impulses C) the ability to shorten upon stimulation D) relatively few cells and a large amount of extracellular matrix
Which of the following statements about villi is correct? (Select all correct choices.)
A. Villi can be found in both the jejunum and the ileum. B. Villi serve to increase surface area. C. Villi allow for enhanced nutrient absorption. D. Villi move food particles through the digestive tract. E. Villi secrete multiple types of digestive enzymes.
Based on fossil evidence, ____ is the oldest of the species listed
a. Homo habilis b. Homo erectus c. Australopithecus africanus
d. Australopithecus afarensis e. Homo neanderthalensis
Which of these trends occurred first in hominid evolution?
A) bipedalism B) tool use C) large brain D) writing