Fluke don't contain bones, while fins do. Flukes go fast while fins steer. Flukes also manage temperature control.
The mantle being made of nickel and iron is the correct statement about the geosphere and is denoted as option B.
<h3>What is Geosphere?</h3>
This is referred to the solid part of the earth and consists of rocky materials present in it.
The geosphere has the mantle which is made up of materials such as iron and nickel which are metals and are responsible for their rigid solid structure thereby ,making it the most appropriate choice.
Read more about Geosphere here brainly.com/question/842883
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The random movement of molecules across a concentration gradient until the difference in concentration between two regions is near zero.
Im thinking it's active transport :) hope it helps.
