The evolution of multicellular organisms would not have been possible without the ability for all cells to interact, in

some capacity, with the external environment through the ____.



a. basal lamina
b. endocrine glands
c. internal fluid
d. gap junctions
e. epithelium


ANSWER: c

Biology & Microbiology

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A species goes extinct without any clear, single cause. 

A. hotspot B. habitat loss C. edge effects D. megafaunal extinction E. extinction vortex

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The first vertebrates appear in the fossil record during the

A. Cambrian Period. B. Proterozoic Era. C. Carboniferous Period. D. Triassic Period. E. Devonian Period

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Includes osteogenic cells, osteoblasts, osteocytes, bone-lining cells, osteoclasts, and osteoid. Osteoid, which makes up one third of organic bone matrix is secreted by osteoblasts. Consists of ground substance and collagen fibers which contribute to high tensile strength and flexibility of bone.

What will be an ideal response?

Biology & Microbiology

If a diploid sperm fertilizes a diploid egg it will produce a ____ zygote.

a)triploid b)tetraploid c)diploid d)haploid e)hexaploid

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