This part of the electromagnetic spectrum produces heat and with special equipment can locate people at night

infrared waves
microwaves
x-rays
gamma waves

Option A, Infrared waves

Explanation:

Infrared waves

Infrared radiations (IR) are the radiation that lies in the wave length range of 700 nanometers to 1 millimeter. However its frequency is the shortest

The wavelength of IR is higher than the visible light and hence it is invisible but it can be sensed as heat due to which they are used in thermal imaging and night vision equipment.  

Therefore, option A is correct.

one centimetre is equal to 0.01 metres

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]