Just like grass, primary producers such as diatoms tend to grow most abundantly where it's sunny and fertile.
(primary producers such as diatoms; tend; to grow most abundantly where it's sunny and fertile) (primary producers such as diatoms; to grow most abundantly; ) (it; 's; sunny and fertile)
primary producers such as diatoms primary producers such as diatoms it
tend to grow most abundantly 's
to grow most abundantly where it's sunny and fertile
sunny and fertile