Select the correct answer. Flagellates are microbes that have a rod-shaped flagellum that helps with their locomotion. Certain flagellates reside inside termites. These
flagellates provide enzymes for the termites to digest cellulose, which helps them survive. In turn, the termites provide nourishment to these
flagellates. Termites need cellulose for their survival, and flagellates obtain nutrition only from termites. Which statement can be true about the
association between these microbes and termites?
O A.
The flagellates share a facultative mutualistic association with the termites.
O B. The flagellates and termites share an obligate mutualistic association.
O c. The flagellates share an obligate parasitic assoclation with the termites.
O D. The flagellates and termites share a commensal association.
O E. The flagellates and termites share a facultative parasitic association.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.