Which are the special proteins in muscles that contract and relax to cause movement?
The later (second) formed primary xylem elements are called _____________.
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RBCs are formed in the ____________ in the adults.
Animals like annelids and arthropods etc where the body can be divided into identical left and right halves in only one plane, exhibit ________ symmetry.
_______ are chlorophyll-bearing, simple, thalloid, autotrophic and largely acquatic (both fresh water and marine) organisms.
The vocal cords in men are about _______ long.
In humans, the sound is produced by the ________.
Nereis, Pheretima (Earthworm) and Hirudinaria (blood sucking leech) are examples of which Phylum?
The first formed primary xylem elements are called ___________.
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