Explanation:ocanic crust is the first one both is the 2nd one and contenetal crust is 3rd one
The upper surface of the fern leaves known as fronds are shiny as a result of
the production of a waxy cuticle.
<h3>What is a Fern? </h3>
A fern is a type of vascular plant which doesn't produce flowers and
reproduces with the aid of spores. Ferns are mostly found in shaded areas
and have a characteristic shiny surface.
The shiny surface is however as a result of the production of waxy cuticles
by the epidermis of the leaves. The waxy cuticle helps to prevent the plant
from water loss.
Read more about Ferns here brainly.com/question/18530534
A covalent bond is also called a molecular bond. it’s the chemical bond that involved the sharing of electron pairs between the atoms.
A doctor can use a 2D image model to show where the break is.
When a patient breaks a leg (the break could be as a result of fracture or bone dislocation), the doctor needs to scan the patient in order to determine the exact location of the break and the extent of the injury.
The gamma camera, x-ray machine and PET scanners are some of the devices that can be used to scan a bone.
Each of these devices uses 2D image technology to show the result of the scan.
So, a model that can be used by a doctor to determine the location of the break is 2D image.
Read more about bone breaks at:
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<span>Present day cactus finches are a type of ancestral finches</span>