Which movement decreases the angle between articulating bones?

Flexion.

Explanation:

Flexion is the movement of bones that occur at sagittal plane. Flexion refers the bending or movement of a limb or join. Flexion allows the movement of hinge joint.

Flexion movement decreases the angle between the two bones. The knee flexion decreases the angle between the femur and tibia. The movement of elbow decreases the angle between the humerus and ulna.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .