Alternative energy sources like solar and wind power
a.
are always available
b.
are only replenished with human intervention
c.
are renewable
d.
are more versatile than fossil fuels

The correct answer for the fill in the blank is A) Are always available and C) Are renewable.

Solar and wind power are the renewable sources of energy. This means that they can be renewed and replenished naturally. The energy from sunlight and  wind that is solar power and wind power never runs off and it is always available.

Thus, option A) and C) are correct for the fill in the blank.

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d