The avian cardiovascular system is able to quickly respond to changes in levels of activity (e.g., resting vs. flying) via changes in heart rate, cardiac output, & blood flow (by vasocontriction and vasodilation of vessels).
A square is a quadrilateral with all right angles and all equal sides. A square is also a parallelogram, a rectangle, and a rhombus and has all the properties of all these special quadrilaterals. Figure 3 shows a square. Figure 3 A square has four right angles and four equal sides. Figure 4 summarizes the relationships of these quadrilaterals to one another.
If the rhombus happens to have its sides at right angles, it's a square, which is a special form of rhombus, which is, in turn, a special form of a parallelogram, which is a special form of a quadrilateral, which is a four-sided planar polygon. Yes a square is a rhombus, one with all angles equal.