are they correct? Squid and snails look different, select the correct statement

Question

are they correct?

Squid and snails look different, select the correct statement regarding these two lineages They are completely unrelated, one is a cnidarian, the other a gastropod They are both mollusks and have a specialized mouth part called a radula b. c. Squids gastropods, snails are cephalopods d. They have their origins in the Archaeon Eon. ) You invent a time machine to study the Earth's past. Of course, the date readout fails so you have no idea how far back in time you went. As your time machine lands, you see an unusua landscape before you with no plants or animals. Upon opening the door, you realize you cannot breathe. You quickly shut the door, realizing you are in the a. Archaean eon c. d. e. Cambrian period Cenozoic era Mesozoic era Late Paleozoic era

Explanation / Answer

Yes, both circled answers are correct.

1. Squid and snails both are mollusks. Suid belong to cephalopoda class of mollusk while snail belong to gastropoda class of mollusk. Radula is present in both. They are believed to have originated in a Precambrian marine environment and thus option a. d and c are incorrect.

2. Archaean eon atmosphere is thought to have nearly lacked free oxygen. Oxygen was introduced later by cyanobacteria.

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