Answer:
They have helical thickening of lignin in their walls to prevent collapse
Explanation:
the primary function of Xylem and its conducting vessels tracheids is to provide support and tranport water and minerals in plants.
Xylem vessels have layers of dead materials in the walls called LIGNIN. Lignin is a polymer; a very strong, hard materials that stop water passage through it,because it contains dead cells,
Therefore the presence of deposit of these strong impermeable, ligified walls in its walls prevent its collapse during mass flow of water of transpiration pull.
Answer:
in the explanation
Explanation:
The independent variable would be us humans polutling the ocean with oil and other plastics destroying the coral reefs. The dependant variable is an abbrasive species of fish becoming overpopulated and killing all the fish that help the coral grow causing the coral to die. (independant variable basically means humans tampering with it causing the problem. dependent is naturally occuring humans cant control whether a fish overpopluates or not thats natural)
Answer:
Eyelashes, wing of a fly, feather of an owl, the tip of your nose, the horn of a goat, your kidney, a maple leaf, a blade of grass, claw of a crab, and petal of a rose.
Explanation:
You have to ask yourself on each one if it is living or non-living.
Answer:The main features of a nauplius are a simple, unsegmented body, three pairs of appendages (antennules, antennae, and mandibles), and a single, simple, “naupliar” eye. Nauplius larvae are found in the life cycles of cirripedes, ostracods, branchiopods, copepods, euphausiids, the decapod peneid prawns, and….
Explanation did this help
Fossils can show structural similarities and differences in organisms over time revealing the vast diversity of life forms that have and continue to exist on Earth.
Comparisons between living organisms and fossils also allow scientists to make inferences about the lines of descent.
