Bone-forming cells are called _____, while cells that dissolve bone, releasing calcium and phosphorus, are _____
osteoclasts; osteoblasts
osteocytes; osteoclasts
osteoblasts; osteoclasts
osteoclasts; osteocytes
C. osteoblasts; osteoclasts
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Which of the following statements is not a reason that conifers are absent from the tropics and are seemingly restricted to more temperate, cooler regions?
A. Conifers' single-celled tracheids cannot support large levels of transpiration, whereas those of angiosperms can. B. Conifer pollination was not as effective in the tropics as their populations became fragmented by angiosperm competition. C. In colder regions the dangers of cavitation due to freezing restrict angiosperm growth. D. In drier regions, the dangers of cavitation due to drought restrict conifer growth.
What is the primary characteristic that groups phyla within the Ecdysozoa?
A. They all have tropchophore larvae. B. They shed their exoskeletons. C. They all have spiral cleavage. D. They all have segmentation.
A zoonosis is an infectious organism in invertebrate animals
a. true b. false
Water vapor contributes to global warming.
Answer the following statement true (T) or false (F)