Why is an environmental contingency plan important? a. an environmental contingency plan is important to assess the effort required to make environmental changes. b.the effects of environmental changes cannot be determined with certainty, so contingency plans are necessary to effectively deal with unexpected changes. c.new environmental conditions cannot be developed without the existence of an environmental contingency plan. d.all of the above 

The effects of environmental changes cannot be determined with certainty, so contingency plans are necessary to effectively deal with unexpected changes.

An environmental emergency is described as a “sudden-onset depression or circumstance occurring from physical, technological or human-induced circumstances, or an aggregate of these, that approaches to cause critical environmental destruction as well as loss of individual lives and property.”

An environmental contingency plan is oftentimes utilized for risk supervision for an extraordinary risk that, though improbable, would have catastrophic outcomes.

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 : )