Answer:
Polydactyly is a genetic condition where formation of extra finger or toe takes place.The extra finger or toe is called as supernumerary.
Explanation:
Polydactyly is associated with mutation in genes in their cis position Mutation in Hoxa gene also results in polydactyly.
It is associated with autosomal dominant mutation that occur in single gene.
This condition appears 1 in every 500.This is a common disorder in African black children and is more frequently found in Africans that are living in Eastern and central part.
Polydactyly is mainly affects the right toe or finger.
It is common in men.
The extra digit may be functional or not,partly formed with some bone.
Protostomes develop a mouth first and then an anus. This is the difference between protostomes and deuterostomes.
In protostome development, there is a spiral radical and indeterminate cleavage. The blastopore becomes the mouth and the coelom forms from the mesoderm.
In deuterostomes development, radial and indeterminate cleavage takes place. The blastopore is the new anus and the coelom forms from budding off the wall of the archenteron.
The answer is b I'm positive
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Answer:
Trace fossils may consist of impressions made on or in the substrate by an organism. For example, burrows, borings (bioerosion), urolites (erosion caused by evacuation of liquid wastes), footprints and feeding marks and root cavities may all be trace fossils.
Explanation: