The pigments something reflects is the color of that object. The cactus is green, so it reflects green and uses every other pigment for photosynthesis.
Dark, rough, and/or porous surfaces absorb the most heat (ex. Asphalt)
Lead resists electro magnetic waves.. it can be seen in many industries used for protective suits against various types of radiations..
Sound travels through all matter but some materials either absorb sound, reflect sound, or just slow sound down.
Control rods that absorb neutrons. These contain some material that strongly absorbs neutrons, boron is most often used but cadmium has similar properties.
As you know, ghosts are sometimes a projection of what has happened earlier in time (some other ghosts have their own lifestyle and have their own minds). A projection is when it "burns a hole in time" and is played back forever (did you know some types of rock "absorb" these different types of playbacks?). If a person cries a lot at the same place at the same time, it could be possible that that is why a ghost seems to "cry".
There are two types of cactus, columnar cactus and climbing cactus. Climbing cactus e.g dragon fruit plant.
Chlorophyll is great at absorbing blue light but not red yellow or green so in order to obtain more energy from the sun plants have other pigments that absorb more of the light spectrum.
Many types of cactus are edible and commonly eaten by people. Prickly pear cactus is one example.
chlorophyll and carotenoid
There are many types of small round cacti, but two are the prickly pear cactus and the barrel cactus.
cactus and shrubs
cactus
cactus
cactus
Types of pigments, types of food reserves, mode of reproduction, types of habitat.
chlorophyll
chlorophyll and carotenoid