Which of the following describes a positive feedback loop? When blood sugar concentration is too low, the endocrine system secretes hormones that increase blood sugar concentration to a normal level.

When the body senses that the heart rate is very high, it secretes hormones that decrease the heart rate.

When blood sugar concentration is too high, the endocrine system secretes hormones that decrease blood sugar concentration to a normal level.

When someone is exercising intensely, the body secretes hormones that increase oxygen supply for cellular respiration.

a few examples of ethical concerns involving genetically engineering of humans include

-privacy of genetically tested people

- potential side effects

-long term effects

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.

transformative rocks are the stones that emerge from the transformation of existing rock composes in a procedure called changeability, implies changing of structures. transformative rocks are shaped from alternate shakes that are changing a result of warmth or weight connected. one of this model is the earth developments that making rocks profoundly cover or crushed which will make the stones warmed and put under awesome weight. they are not softening but rather the minerals they are containing are changed synthetically that will shape transformative rocks. now and again different rocks are shaped when the others are near some liquid magma and getting warmed.