Bee on a stick in a white box with a barcode and two stickers attached…

Piece of white marble on a white background with a scale on the right…

White surface with a ruler

Close up of four different types of shells on a black background

Black and white x-ray of a human hand with a fracture in the middle of…

Drawing of a house on a piece of paper placed on a surface

Black and white drawing of a man with a mustache wearing a military…

Close up of a zooplankton

Piece of paper with a ruler next to it on a table