The patellar reflex or knee(j)erk reflex doesn't happen when your leg is straight because the tendon is relaxed. In order for the reflex to be elicited, the tendon must be flexed or stretched.
Answer:
the correct option is E.
Explanation:
in this case the shrew occupies the level of both secondary and tertiary consumers.
as the shrew eats spider( a secondary consumer) so it is a tertiary consumer but it also eats snails( a primary consumer) so it is therefore a secondary consumer also.
so the shrew occupies both secondary and tertiary consumer trophic level.
A at right angles
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The movement produces oscillating electric and magnetic fields, which travel at right angles to each other in a bundle of light energy called a photon. ... Magnetic and electric fields of an electromagnetic wave are perpendicular to each other and to the direction of the wave.
C.Stimulation of thoracic or lumbar spinal regions,chain ganglion,acetylcholine release