Answer: the crab will evolve to have more powerful claws.
Explanation: Evolution is the change in the characteristics and features of a species over generation which develops due to natural selection and adaptation within the course of time. The predator is an organism which kills other organism to obtain it as food. The prey is an organism which is killed by the other organism.
According to the given situation, if the prey develops special adaptations to prevent itself from the predator. The predator will also be evolved so as to obtain prey as food. Therefore, the crab will evolve to have more powerful claws is the correct option.
D (characteristics of living things)
All things in existence are made up of matter, which can either be living or non-living depending on whether or not they have LIFE in them. This means that the possession of life distinguishes a living thing from a non-living thing. This life that living things possesses makes them able to perform certain functions called their characteristics.
Based on these, the characteristics of living things have been summarized into an acronym called MR NIGER D with each letter meaning a particular characteristic.
M- Movement (ability to move)
R- Reproduction (ability to produce young ones)
N- Nutrition (ability to absorb nutrients)
I- Irritability (ability to respond to stimulus in the environment)
G- Growth (ability to increase in size, weight and height)
E- Excretion (ability to pass out waste products from the body)
R- Respiration (ability to obtain energy)
D- Death (ability to die)
Looking at all these characteristics, they are possessed by insects, plants, animals, humans etc. Hence, they are all grouped as living things.
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DNA backbone is made up of deoxyribose monomer sugars as the basic unit that are covalently connected in chains. Each deoxyribose sugar is a five (5)-carbon ring. The 5’ carbon covalently bonds with a phosphate while the 3’ carbon bonds to the next deoxyribose carbon ring. The 1’ carbon is covalently bonded to a nitrogenous base (either Adenine, Thymine, Cytosine, or Guanine ).
In DNA, Cytosine pairs with Guanine, and Adenine pairs with Thymine. In RNA, the same principle applies only that RNA has no Adenine base but Uracil. Therefore, Thymine pairs with Uracil while, similar to in DNA, Cytosine pairs with Guanine.
Covalent bonds occur in virtually all the bonds except between nitrogenous base pairs of opposite strands of DNA.
The central Dogma stipulates that DNA --à RNA--àProtein. During transcription, information on DNA is copied to messenger- RNA. In eukaryotes messenger- RNA moves to the cytoplasm where it is then translated to protein by ribosomes. In prokaryotes, since there is no nucleus, the mRNA is translated even as transcription continues.