Considering only the initial and final situations, identify which mechanical energies have changed. in addition, determine whether you will need to consider any work done by external forces or changes in thermal energy.
check all that apply.
a) kinetic energy has changed.
b) gravitational potential energy has changed.
c) spring potential energy has changed.
d) work by external forces on the system must be considered.
e) thermal energy of the system has changed.

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.

false.

explanation:

this statement is false. after falling for 5 seconds, its speed will not be 100 m/s.

answer: the correct answer for the fill in the blank is rods.

rods are the specialized photoreceptor cells that are present in the retina of human eye. they are responsible for vision in the night time ( also called scotopic vision). they have very low visual acuity and color distinguishing ability.

as they are responsible for vision in night time, therefore they are found predominantly in the nocturnal animals.