Which Ecdysozoan phylum includes insects, spiders, crustaceans, millipedes, and centipedes?

a. Onychophora
b. Nematoda
c. Arthropoda
d. Nemertea


Ans: c. Arthropoda

Biology & Microbiology

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Flowering plants

a. only reproduce asexually. b. produce clones through sexual reproduction, and under certain circumstances seeds through asexual reproduction. c. reproduce asexually about half the time and sexually about half the time. d. only reproduce sexually. e. produce seeds through sexual reproduction, and under certain circumstances clones through asexual reproduction.

Biology & Microbiology

Chemical subunits called amino acids combine to make ____________________. Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

Special bone cells, called ________, are responsible for laying down new bone.

A. osteoclasts B. Haversian canals C. osteocytes D. osteoblasts

Biology & Microbiology

Chloroplasts are thought to have originated as endosymbiotic associations when aerobic bacteria engulfed photosynthetic cells. This relationship was favored by the production of ____ by the endosymbiont.

A. glucose B. hydrogen ions C. ATP D. oxygen E. water

Biology & Microbiology