Matthias Schleidan observed plant leaves under a microscope. How did this help contribute to cell theory It helped to show that all plants are made of cells.
It helped to show that all plants are made of chloroplast.
It helped to show that plant cells can be created from soil.
It helped to show that plants cells cannot function independently.

kuchisake

kuchisake-onna (口裂け女, "slit mouth woman ") is a malevolent figure appearing in japanese ghost stories, possibly dating back to the edo period. she takes the form of a masked woman who approaches people and asks them if they believe she is pretty.

explanation:

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3