Question 15 (2)

need help asap
- 20 points included
it’s a quiz !

What is a group of organisms that are closely related and share similar characteristics

Why is earth's outer core hotter than earth’s oceanic crust? earth’s oceanic crust is denser than earth’s outer core is. earth’s oceanic crust has lava flowing from the mantle. earth’s outer core has a composition of solid iron and nickel. earth’s outer core is deeper within earth than oceanic crust is.

Which muscle cell structure stores calcium ions that are used to trigger the contraction?