Artificial fertilizers have been developed through scientific research. Which of these is a positive impact of artificial fertilizers?
A. More food can be produced for a growing population.
B. Long-term use can disrupt the balance of the ecosystem.
C. Chemical runoff feeds photosynthetic organisms in bodies of
water.
D. Plants absorb more nutrients which are passed on to consumer

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

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.

i hope this : )