Because environment is not always steady.😁
Large organisms need transport systems to supply all their cells with food, oxygen and other materials.Multi-cellular organisms are too big and not all of their cells have contact with the external environment. All organisms need to exchange substances with their environment - take in needed molecules and get rid of waste. A uni-cellular organism can use the processes of osmosis, diffusion and active transport to transport substances in and out of the organism, which is in this case just one cell. But as organisms increase in size, they need a specialized transport system to exchange substances between the internal environment and the external environment. Interestingly enough, osmosis and diffusion are still the important mechanisms at the cellular level.
Water, Oxygen and Nutrients.
Chemicals that must be reported if released into the environment are considered hazardous substances by the Environmental Protection Agency (EPA) in the United States. These substances can pose a risk to human health or the environment, and their release must be reported to ensure proper handling and response measures are taken.
depending on the environment organisms must adapt in certain ways so they can survive
All unicellular organisms must perform basic life processes in order to survive. These processes include: Metabolism: Unicellular organisms need to generate energy from the consumption of food and other organic molecules. This energy is used for various activities such as growth, reproduction, and movement. Growth: Unicellular organisms must grow and divide in order to increase their population size. Movement: Some unicellular organisms have the ability to move in order to find food, avoid predators, and reproduce. Reproduction: Unicellular organisms must be able to reproduce in order to increase their population size. This can be done asexually, through binary fission, or sexually, through the exchange of genetic material. Excretion: Unicellular organisms must excrete waste products in order to maintain homeostasis. Sensing the Environment: Unicellular organisms must be able to sense their environment in order to detect changes in temperature, pH, and other factors that could affect their survival. Responding to Stimuli: Unicellular organisms must be able to respond to changes in their environment by making appropriate adjustments in order to survive. In summary, all unicellular organisms must perform basic life processes such as metabolism, growth, movement, reproduction, excretion, sensing the environment, and responding to stimuli in order to survive.
true
then the organisms must compete for living space The population will decrease.
Our body is made up of prokaryotic cells. These cells are not in the contact with the environment. So the process of diffussion cant make any difference in exchange of gasses between the multicellular boy and environment.
The main function is to keep the organism and its environment separate. After separating the organism and its environment, the membrane must also provide means to bring into the cell things it needs from the environment and take out of the cell things that must be disposed of.
cell membrane, which acts as a protective barrier around the neuron. This selective barrier controls the passage of substances in and out of the neuron to maintain its internal environment.
Organisms are not isolated in their environment. Organisms must interact with other individuals of their own species, with other species, and with their physical environment. The study of the interactions between organisms and their environment is called ecology (Greek: oikos- house; logia- study). The study of ecology can encompass all aspects of Biology; from physiology to behavior, because any change within an organism has the potential to affect its relationship with the environment.
they must breathe with lungs instead of gills