Only 100 living species are known in this Ecdysozoan phylum. Called velvet worms, they have jaws,
an open circulatory system, and relatively large brains.
a. Arthropoda
b. Onychophora
c. Nemertea
d. Annelida
e. Nematoda
B
Biology & Microbiology
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Humans are capable of synthesizing 12 of the 20 naturally-occurring amino acids without having to obtain them from our diets
A. true B. false
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In flowering plants, companion cells are connected via plasmodesmata to ____
a. trichomes b. tracheids c. sieve tube elements d. guard cells e. vessel members
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A rise in oxygen in Earth's air and seas put organisms that engaged in _____ at a selective advantage
a. aerobic respiration b. fermentation c. photosynthesis d. sexual reproduction
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What are population pyramids used to show?
A. death rates B. birth rates C. competition D. age composition of a population E. the carrying capacity
Biology & Microbiology