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Why might an organism self-fertilize rather than outcross?

What do we refer by “digestion”?

Since life evolved in the sea, most invertebrate organisms are osmoconformers. This means they are:

The following is an excerpt of an article about nutrition in humans. Please read and match the following statements with the role they would have on a future study. “In promoting reductions in dietary fat intakes, many health professionals have encouraged people to reduce their useof red meat, even though red meat is an excellent dietary source of iron and zinc, as well as being the main source ofvitamin B12 in the diet [1].  Our meat research program was originally stimulated by observations that, when urbanised, diabetic AustralianAborigines reverted temporarily to their traditional hunter-gatherer diet, there were improvements, not only in themetabolic abnormalities of diabetes [5], but also in several risk factors for cardiovascular disease. These beneficial changes occurred despite the diet containing substantial quantities of meat from wild game animals [6, 7]. The diet was low in fat (13 % energy) despite being rich in red meat, as meats from wild animals are extremely lean, of the order of 1–2 % fat [8], much of which is structural lipid and, therefore, rich in polyunsaturated fatty acids (PUFA) [9].” After these observations, researchers carried out a study comparing men under a low-fat meat diet vs. men under a vegetarian and vegan diets. To measure the impact of the diet, they measured micronutrient levels like iron and zinc and looked at cholesterol and PUFA levels.

The following is a diagram of the circulatory system in mammals. What number represents a vein?

Which transport system in plants is made of living cells?

In animals, sex can be determined

What is the feedback loop that is active during ovulation?

Which one of these is NOT a component of nonspecific (innate) immunity?

How can plants regulate molecules that come through the apoplastic route  in roots, before going into the xylem?