What does $a$ indicate in the given figure?

The visible form of Protista is...

Red oceanic tides can be due to

Protozoans are not included in kingdom $Animalia$ because they are

$A$ living $Amoeba$ is:

Consider the following statements and select the correct set of features with respect to the life cycle of acellular slime moulds:
$a.$ Haploid vegetative stage as myxamoebae
$b.$ Diploid vegetative stage as plasmodium
$c.$ Capillitium
$d.$ Photosynthetic protists
$e.$ Sporic meiosis
$f.$ Isogamous sexual reproduction
$g.$ Anisogamous sexual reproduction with zygotic meiosis