2 02
Human reactions are a response to an external change.
02
Reflex actions help to protect the body against damage.
Figure 2 shows the nervous pathway for a reflex action.
Figure 2
Hot pan
Muscle in arm
A stimulus from the hot pan will cause the muscle in the arm to contract and move the
finger away.
Describe how the stimulus from the hot pan reaches the muscle in the arm.
[4 marks]​

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.

the answer u all are looking for is 4000000000000000000000 million years.