Some mollusks are nearly microscopic.
Mollusks are the second-largest invertebrate group.
Some  invertebrates are nearly microscopic.
Some _ are nearly microscopic

[1] gastropod shells
[2] invertebrates
[3] peachleaf willow
[4] homogenous
[5] barnacles
[6] an organism's body
[7] Veins and arteries.
[8] reproduce