However, some bees collect pollen only from flowers of certain families, others from flowers of certain colours.
The removal of certain colours, noticeably the green and yellow shadings for blurbs and panels, are welcome.
For example, "colour-hearing," in which people say that specific sounds evoke in them the actual experience of certain colours, is relatively frequent.
Because of its great power of absorption of certain colours, alexandrite looks green in daylight and reddish purple in artificial light.
Auctioneers themselves admit that prices are influenced by such bizarre factors as the use of certain colours – this painting is heavy on the Van Gogh yellow.
Satin bowerbirds, Ptilonorhynchus violaceus, are an excellent species for testing this hypothesis because their complex male courtship, including use of decorations of certain colours, suggests a selective advantage to individuals with superior cognitive abilities.
When combative males strut their colourful stuff, they are changing the spacing within each crystal lattice, creating what are called bandgaps that permit or preclude the passage of certain colours.
The idea is to try to combine the flexibility of plastics with the proven efficiencies of inorganic semiconductors.Because the rods are so tiny (ie, 10,000 times thinner than hair), they take advantage of phenomena that work at the quantum level where the absorption of certain colours of light increases by a factor of two.
She was against rules, against prejudice, against "anything which sets unnecessary bounds to one's imagination or limits one's train of thought, prohibition about the combination of certain colours, regulations about the proportion of flower to vase and the labelling of some plants for consumption and others for decoration".
Experiments show that avoidance is learned in birds, mammals, lizards, and amphibians, but that some birds such as great tits have inborn avoidance of certain colours and patterns such as black and yellow stripes.
