Answer:
A. solar energy in the rays of sunlight
Explanation:
photons in the sunlight rays will excite the electrons in the water molecule and hence will provide the energy for calvin cycle.
Angiosperms have a vascular system and can live is harsher environments which means they can reproduce a lot more often and faster.
In meiosis? Tetrads maby? When two homologus chromosomes do crossing over they're called tetrads so..
Cloudy day because of solar radiation