Sexual reproduction requires the fertilization of an egg by a sperm.
a. true
b. false
Ans: a. true
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"Accomodation" is the process in the eye of
A. bending light rays to varying degrees by the lens. B. converting light energy into electrical signals by the retina. C. adjustment to varying light levels by altering the sensitivity of the eye. D. adjustment of the amount of light admitted to the eye by adjusting pupil diameter. E. regulation of vitreous humor volume.
This lineage of Echinoderms is made up of sea lilies and feather stars, although the group was much
more diverse and abundant 500 million years ago. Adult feather stars can swim or crawl, while adult sea lilies are sessile, with their central disk attached to a stalk.
a. Echinoidea b. Ophiuroidea c. Crinoidea d. Holothuroidea e. Asteroidea
DNA vaccines ____
a. use RNA to assist in the transformation process b. have been created but are ineffective c. show promise in animal studies and are now in clinical trials d. have been approved by the government to fight several diseases e. sometimes infect the subject with the disease it’s attempting to fight
A human nerve cell that has an abnormal shape most likely has a defective
A. cell wall. B. cytoskeleton. C. nucleus. D. ribosome.