If a plant has both male and female reproductive organs it is:
a) monoecious.
b) dioecious.

(a) Monoecious

Explanation:

Monoecious refers to plants which have both male and female reproductive organs. Most of the plants have both male and female reproductive organs.

Dioecious describes a plant group that have distinct male and female plants. monoecious is also known as single house as male and female are found in single individual and dioecious is also known as double house as it has distinct male and female plants  

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high