What is the difference between mass and weight?

a. mass is a measure of the amount of matter in an object, while weight is a measure of the force of gravity on the object.
b. weight is a measure of the amount of matter in an object, while mass is a measure of the force of gravity on the object.
c. mass is a measure of an object's inertial force, and weight is the force exerted by that object on other objects.
d. mass and weight are synonyms and ultimately describe the same principle.

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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the food storage products of chrysophytes are oils or the polysaccharide laminarin.   formerly classified as plants, the chrysophytes contain the photosynthetic pigments chlorophyll a and c all but the yellow-green algae also contain the carotenoid pigment fucoxanthin.