2006-09-20 10:35:02 · 7 answers · asked by Anonymous in Education & Reference ➔ Higher Education (University +)
yes, they do lack a cell wall. cell walls protect cells, but it also slows down transfussion between cells and their surroundings. animal cells need more flexibility for various reasons(nutrients, signals from other cells, etc), giving up the cell wall is an evolutionary advantage.
2006-09-20 10:53:06 · answer #1 · answered by musi 3 · 0⤊ 0⤋
The lack of a rigid cell wall allowed animals to develop a greater diversity of cell types, tissues, and organs. Specialized cells that formed nerves and muscles—tissues impossible for plants to evolve—gave these organisms mobility. The ability to move about by the use of specialized muscle tissues is a hallmark of the animal world, though a few animals, primarily sponges, do not possess differentiated tissues. Notably, protozoans locomote, but it is only via nonmuscular means, in effect, using cilia, flagella, and pseudopodia. Due to the lack of a rigid cell wall, animal cells appear to be circular (though are often deformed by surrounding cells) under microscopes
2016-03-26 23:34:10 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Animal cells have a cell membrane instead of a cell wall, making tissue flaccid.
2013-12-16 14:58:06 · answer #3 · answered by Anonymous · 0⤊ 0⤋
animals are made up of living cells
all cells have a wall or membrane
2006-09-20 10:42:27 · answer #4 · answered by Mopar Muscle Gal 7 · 0⤊ 0⤋
they dont, they lack a cell membrane. not the wall =]
2006-09-20 10:42:40 · answer #5 · answered by Anonymous · 0⤊ 0⤋
They don't.
2006-09-20 10:41:18 · answer #6 · answered by Catspaw 6 · 0⤊ 0⤋
OMG they do!
2006-09-20 10:43:17 · answer #7 · answered by Grev 4 · 0⤊ 0⤋