What is the defining characteristic of the hornworts?
a. sporophytes
b. broad leaves
c. cones
d. jointed stems
a. sporophytes
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Which disease CANNOT be prevented via the use of a vaccine generated from an attenuated pathogen?
A) malaria B) measles C) mumps D) rubella
Mutation is one of the two factors that increase genetic variation
A. true B. false
Life is thought to have evolved from complex molecules formed by the interaction of smaller molecules in oceans and the atmosphere. The substance which brought these molecules together to interact is
A. buffers. B. acids. C. water. D. salts. E. hydrogen.
Which of the following are components of vertebrate gravity receptors?
I-Utricle and saccule chambers of a membranous labyrinth. II-Hair cells with stereocilia and kinocilium. III-Hairlike processes embedded with otolith membrane, a gelatinous membrane containing calcium carbonate crystals. IV-Peripheral chemoreceptors. A. I and II only B. II, III, and IV C. I and IV only D. I, II, and IV E. I, II, and III