Which change is chemical?(1 point) water undergoing electrolysis
water boiling
water evaporating
water freezing

Which number remains unchanged during photosynthesis?(1 point)

the number of glucose molecules
the number of carbon dioxide molecules
the number of carbon atoms
the number of water molecules

In a chemical reaction, which aspect of the reactants changes?(1 point)

atoms
total mass
mass
nuclei
A young snake eats and digests a mouse. The increase in the snake’s mass equals(1 point)

the mass of the mouse minus the mass of waste produced by the snake.
the mass of the mouse plus the mass of waste produced by the snake.
the mass of the mouse.
the mass of the mouse plus the original mass of the snake.
Cellular respiration transforms glucose and oxygen into carbon dioxide, water, and energy.

C6H12O6 + 6O2 → 6CO2 + ?H2O + Energy

Based on the law of conservation of matter, what is the missing coefficient for water?

(1 point)

2
4
6
8

*will mark brainliest to first correct answer* photosynthesis led to increasing levels during the later proterozoic eon? a. oxygen b. water c. carbon dioxide d. none of the above

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?

Hurry i need your (100 points) 1) what are the responsibilities of the region of the brain highlighted below? (picture located below) the highlighted portion is at the rear base of the brain, behind the brain stem. regulating homeostasis, hunger and eating, thirst and drinking, and many other functions of basic survival. coordinating movement and balance by using information from sensory nerves, including hand-eye coordination. controlling voluntary body movements, processing information from sense organs, thoughts, and learning abilities. regulating important involuntary bodily functions such as blood pressure, heart rate, breathing, and swallowing. 2)which of the following systems or structures is correctly paired with its function? neurons - brain cells that control thoughts, calculations, and memory cerebral cortex - portion of the brain that controls involuntary body movement peripheral nervous system - carries impulses to and from the central nervous system central nervous system - carries information from the nerves to the muscles and glands