All of the following describe a passive solar energy system EXCEPT A. heat is mechanically moved to a storage area for use at a later time.
B. architectural designs are major components to the system.
C. the systems have been used for the past 1000 years or so.
D. the systems function without mechanical power.

what following? you said which of the following. but there is no be more specific.

burning of wood and coal

explanation:

the panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in earth's temperatures over the past 50 years.

a

explanation:

many plants naturally reproduce this way, but it can also be induced artificially. horticulturalists have developed asexual propagation techniques that use vegetative plant parts to replicate plants. success rates and difficulty of propagation vary greatly. monocotyledons typically lack a vascular cambium and therefore are harder to propagate.

the question isn't complete here so i can't right an answer '_'