Answer:
an ecosystem consists of a population of organism and it's physical environment,and a population is made up many different communities of organism.
The answer is a cell wall.
The cell wall surrounds cell membrane of some
cell types. It is present in plants and fungi, as well as prokaryotic cells and its role is structure and protection. Turgor pressure makes a pressure on plasma membrane against the cell wall. If there were no cell wall around the cell, when cytoplasm gains the water, the cytoplasm will swell until plasma membrane burst. But, cell wall is rigid structure that helps plant cell to keep its shape <span>no matter how much water is in the vacuole.</span>
Stars are born within the clouds of dust and scattered throughout most galaxies. A familiar example, a dust cloud is the Orion Nebula. Turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction. Stars begin their lives as clouds of dust and gas called nebulae. The gravity of a passing star or the shock wave from a nearby supernova may cause the nebula to contract. Matter in the gas cloud will begin to coalesce into a dense region called a protostar.
The cell cycle is separated into two major phases that alternate with each other: Interphase, during which the cell grows, preparing for mitosis and duplicating it's DNA, and then the mitotic phase, in which the cell divides into two genetically identical daughter cells.
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2. Dinosaurs appeared before mammals (a)