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The hydra has two body layers of cells called
Which of the following best describes a colony of volvox?
Amoeba obtains its oxygen requirements
Which of the following structural features are adapted for uses other than water conservation?
Complex social behaviour and organization are found mostly in
A certain savanna grasshopper changes colour from green during the rainy season to brown during the dry season and black after dry season bush fires. The reason for these colour changes is that the
The mutation theory of organic evolution was propounded by
Example of water-borne and sex linked diseases are?
In a group of male Agama lizards, the one with the brightest head colour is the
The older fossil-bearing rocks, in contrast to the more recent ones, are more likely to contain?
Blood grouping in human beings is derived from combinations of
The surest way to combine the best qualities of both parents in the offspring is by
The pollutants that contribute to the depletion of the ozone layer in the atmosphere are
A cross between an albino female and a genetically normal male will result in offspring that are
The factors that determine the distribution of vegetation zones are
The legs and beak of an egret resemble those of the heron because they
The disaster that would have the least destructive impact on animal life and balance in nature is
In a food chain, each succeeding level in a forward direction represents
Which of the following is an adaptation of tropical rainforest species?
Which of the following are adaptations of animals to aquatic habitats?