<span>gills; lungs
Sharks have spiracles, also for whales they have lungs. Moreover look at amphibians, they live near water sources because they need an area where they can lay and protect their eggs. The early stages of an amphibian's life is spent mostly underwater. This is where they mature and slowly develop into land organisms. In the early stage of their life, they breathe through their gills and they do not have limbs yet. As they grow gradual changes in their body structures are prominent, this process if called metamorphosis.</span>
It depends on the cell type. If it's a tissue cell, it will divide into 2 daughter cells through the mitosis process. If it's a gamete cell, it will divide through meiosis into 4 daughter cells.
Hope this helps!
One: The cell is able to move material in and out of the cell
Two: It helps the cell maintain necessary conditions for life
1. Three (3) Phylums
2. Nine (9) Classes
3. The Class has more groups.
4. The Phyla contains more organisms.
The bivalve that was a keystone in Iowa, making sure the water stayed clean and filtered, is shellfish.
<h3>What are shellfish?</h3>
Shellfish is a term used to describe the fishes that have exoskeleton and are used to eat.
The shellfish is divided into two groups:
- Crustaceans: shrimp, prawn, lobster, etc
- Molluscan/ bivalves: oysters, clams, mussels, etc.
So, the molluscan are believed to keep the water bodies clean
Thus, the keystone species is shellfish.
Learn more about shellfish
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