Answers
The explanations that provide support for continental drift theory are;
• Coal fields match up across continents
• Tropical plant fossils were found in Arctic areas
• Similar rock types are found across continents
• Evidence of glacier can be found in South Africa
Explanation
According to Alfred Lothar Wegener in his studies on the origin of continents and oceans, he outlines that the theory of continental drift can be supported by five evidences which are; the jigsaw fit of the continental alignment, geological fit, tectonic fit, glacial deposits and fossil evidence.
The animal is an Amphibian.
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Answer:
The correct answer is: The limited variability in the size of shells in the initiating population.
Explanation:
- The shell size in snail species is determined by a number of variants (alleles) of the gene that is responsible for determining the size of their shell.
- The number of variants of the gene encoding for shell size is limited.
- However, the different variants may encode for different shell size, say from 5 millimetre to 20 millimetre.
- All these variants are present in the original population of snail but in different proportions.
- However, if predation tend to target the snail species with smaller shell size (5 millimetre to 10 millimetre) then evolution would tend to increase the frequency of snails having the larger shell variants (15 millimetre to 20 millimetre).
- This will result in a population of snails with increased shell size.
- However, an increase in shell size over 20 millimetre is not possible because no allelic variants encoding for a shell size greater than 20 millimetre is available in the population.
8. Yes it's an organic molecule because it contains nitrogen and oxygen, among other elements needed for a molecule to be labeled as organic.