Answer:
Freshwater
Explanation:
Protonephridia are made up of many flame cells. Flame cells are specialized excretory cell found in the simplest freshwater invertebrates like flatworms.
Proteins can - primary secondary tertoary and quaternary structures.
Answer:
Share valence electrons
Explanation:
Covalent bonds are also known as molecular bonds. This is the type of bond that occurs between non-metals and non-metals. This type of bond can happen between two of the same elements or with other elements that are usually positioned near each other in the periodic table.
This is different from ionic bonds where atoms are lost or gained. This type of bonds occur between metals and non-metals.
Answer:
This structure provides support and protection for plant cells = Cell Wall
This is a large, central fluid-filled structure that provides turgidity = Vacuole
A thin semipermeable barrier around the cell which regulates what enters and leaves the cell = Cell membrane
The control center of the cell = Nucleus
It is often described as the cells Power Plant = Mitochondria
This is used by plant cells for photosynthesis = Chloroplast
Hope this helps :)
Plz mark Brainliest :D
Explanation:
The giant blue thing is the vacuole
The thin yellow line is the cell membrane
The yellow and orange ball is the nucleus
The light green thing with zig zag lines is the mitochondria
The dark green thing inside the cell is the chloroplast
The thing outside the cell is the cell wall its green
Natrual variations i think
