What single-celled pathogens are more complex than bacteria and cause diseases like malaria? ?

The correct answer is protozoans.

Explanation:

Protozoans are the single-celled pathogens, which are more composite in comparison to bacteria and results in diseases like malaria. Malaria is the resultant of the protozoan parasite known as Plasmodium. Malaria in human beings is caused by four distinct species of Plasmodium. These are P. falciparum, P. ovale, P. malariae, and P. vivax.  

However, humans in certain cases become infected with the species of Plasmodium, which generally infect animals. The transmission of the malaria parasite takes place by the female Anopheles mosquitoes, which primarily bites between the dusk and dawn.  

the electromagnetic energy from the sun arrives in the form of visible and invisible light.

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.