to classify it as a protostome, zoologist must see for the mouth development in the embryo.
Explanation:
The protostome are the animals which are unique to their three germ layer in embryonic development, with the bilateral symmetry as they have the ability to fly with other protostome developments.
the one characteristic feature to distinguish them as the protostome, mouth part development is to be sought as the mouth develops but not the anus in the embryo. the mouth parts serves unique to the group and their feeding structures.
Answer:
Answer: The combination of phosphate, sugar, and nitrogen bases in DNA or RNA is called a nucleotide.
Explanation:
Explanation: Nucleotides are building blocks of RNA and DNA. In RNA, nucleotide are made up of ribose sugar, a nitrogenous base which can be adenine, uracil, cytosine and guanine; and a phosphate group. The nucleotides in RNA are called ribonucleotides. The nucleotides in DNA are called deoxyribonucleotides and they contain a deoxyribose sugar, a phosphate group and a nitrogenous base which can be adenine, thymine, cytosine and guanine.
The world’s deepest lake is Lake Baikal in Russia. And you’ll find there the <span>Baikal seal, Lake Baikal seal or nerpa. It is a type of </span>earless seal <span>widespread to </span>Lake Baikal in Siberia, Russia and the only mammal there. Like the Caspian seal, it is interrelated to the Arctic ringed seal. The Baikal seal is one of the smallest true seals and the
only completely freshwater
pinniped<span> species. It remains a scientific ambiguity of how
the seals initially came to Lake Baikal, hundreds of kilometers from any ocean.</span>
It is a mathematical function that describes the wave-like behavior of either one electron or a pair of electrons in an atom.
Hope this helps. Can I also please have the 90 points? Thank you, and I hope this helps you. ( ;
<span>19. At the end of this period, 96% of all life went extinct. This set the stage for reptiles to really take hold in the next era. - PERMIAN
</span><span>20. This is the first period of the Mesozoic Era. - TRIASSIC
21. This was the era of "ancient" life and was divided into six periods. - PALEOZOIC
22. Which era spans the least amount of time on the geologic time scale? - CENOZOIC
Precambrian - 544 million years ago
Paleozoic - 544 - 248 million years ago
Mesozoic - 248 - 65 million years ago
Cenozoic - 65 million years ago</span>