which cross section best represents the pattern of sediments deposited on the bottom of a lake as the velocity of the stream entering the lake steadily decreased

Chalk is an ionic compound. which is a property of all ionic compounds that makes chalkboard? particularly useful for writing on a a high melting point hardness and brittleness inability to dissolve in water a multicolored appearance

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Me with biology endocrine system crossword also image left i need with hw