Option D – amphibians may use their skin for gas exchange is the characteristic feature of amphibians that differs from reptiles.
Explanation:
The amphibian skin is moist, thin and marbled and supplied by blood vessels running on its surface. The moisture present in the skin dissolves the oxygen present in its surrounding which is absorbed by the blood vessels. Special glands help the amphibians to keep the skin moist.
The very thick and tough scales present on the reptiles prevent them to absorb oxygen through their skin. Hence, they breathe and respire through their lungs.
Amphibians have three-chambered heart. They do not develop amniotic eggs. Adult amphibians although spend much time on land, they breed only in water due to the absence of amniotic sac
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Answer: Sea stars move using a water vascular system. Water comes into the system via the madreporite. It is then circulated from the stone canal to the ring canal and into the radial canals.
Explanation: The radial canals carry water to the ampullae and provide suction to the tube feet.
A. rust because rust is the only chemical weathering listed in the answers that i know of
Hope this helps!!!!!!!!
Answer:
The mRNA molecule will be synthesized running in the 5' to 3' direction.
Explanation:
From the DNA sequence:
5'-ATCGTACCGTTA-3'
3'-TAGCATGGCAAT-5'
mRNA sequence is
5'-AUCGUACCGUUA-3'
Amino acid sequence will thus be:
Ileu-val-pro-leu.
Because types of chemicals in minerals need to form.
