First blank: the sun
Second blank: not sure
Third blank: temperature
Euglenoids, dinoflagellates, and usually Diatoms are unicellular while brown algae, red algae and green algae may be multicellular. Photosynthetic pigments are found in all algae like chlrophyll a and yellow or orange carotenoids. Also, almost all algae is aquatic. Also, all algae are eukaryotes and the sex organs are unicellular in all algae.
The process of called photosynthesis.
All releasing hormones (ending in RH) from the hypothalumus (GHRH, CRH, GnRH, TRH), and these hormones released from the anterior pituitary (ACTH, FSH, LH, TSH) lead to release of other hormones in the body.