A person with a diet very low in iron may not be able to make enough of a formed element in the blood called ________
Fill in the blank(s) with correct word
red blood cell
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Double fertilization refers to
(a) fusion of two sperm nuclei and two egg cells. (b) fusion of one sperm nucleus with two polar nuclei and fusion of another with the egg cell nucleus. (c) maturation of the ovary into a fruit. (d) none of the above.
All of the following are evolutionary trends in the development of nervous systems for bilaterally
symmetrical animals except:a. an increased number of neurons. b. concentration of neurons. c. specialization of function. d. simplistic synaptic contacts allowing integration. e. cephalization.
What is the main force by which most of the water within xylem vessels moves toward the top of a tree?
A) active transport of ions into the stele B) evaporation of water through stoma C) the force of root pressure D) osmosis in the root
Which of the following are not included among the bilateria, a clade of animals with bilateral symmetry at some stage of development?
A) sea stars (Echinodermata) B) earthworms (Annelida) C) sea anemones (Cnidaria) D) octopus (Mollusca)