answer:Altering the flow of water sources through hydroelectric dams can lead to changes in river direction, depth, temperature, and width. These changes can negatively impact organisms in the ecosystem by affecting their habitat, food sources, migration routes, and water quality due to increased sedimentation and nutrient accumulation.

answer:To estimate, we can round both numbers to the nearest ten. Thus, 20 is rounded to 20, and 67 is rounded to 70. The estimated product is 20 multiplied by 70, which equals 1400. The actual product of 23 and 67, calculated precisely, is 1521. As expected, the estimated value is close to the actual value.

answer:In an elastic collision, both momentum and kinetic energy are conserved. This means that the total momentum and kinetic energy of the system before the collision is equal to the total momentum and kinetic energy after the collision. Examples of elastic collisions include the collision of billiard balls or the bouncing of a rubber ball off a wall. In an inelastic collision, momentum is conserved but kinetic energy is not. Some of the kinetic energy is lost as heat, sound, or deformation of the objects involved in the collision. Examples of inelastic collisions include a car crash or a ball of clay hitting a wall.

answer:Similarities: * Both buildings were raised on high ground, reminiscent of Ancient Greek temples. * Both featured columns supporting a roofed structure. * Both employed classical architectural elements, such as pediments and entablatures. Differences: * The Maison Carrée was a Roman temple, while the Virginia State Capitol was a government building. * The Maison Carrée featured Corinthian columns, while the Virginia State Capitol used Ionic columns. * The Maison Carrée was a rectangular building, while the Virginia State Capitol had a more complex shape with wings and a central rotunda.