A scale shows the distances bewtween places on a map.
It is known as hypothesis.
Before experiments, we should set up a hypothesis so that we can expect what happen. But hypothesis does not always has to be right, that's why we have to do experiments to test.
If a hypothesis matches the experiment result, a theory is formed. If it does not, we should adjust different variables in the experiment and set a new hypothesis again.
Answer:
The scientific study of life, called <u>Biology</u><u>, </u>can be organized around several themes. As the biological hierachy builds from molecules on up to ecosystems, each level has <u> emergent properties</u> that result from interactions among component parts. Life's basic unit of <u>structure and function</u> is the cell, which occurs in two basic forms- prokaryotic and eukaryotic . As organisms interact with the environment, <u>nutrients and chemicals</u><u> </u>cycle within an ecosystem, while energy flows one way from sunlight -> chemical energy -> heat. According to the core theme of <u>evolution </u>all of life is related by common descent. Life was diversified as <u>natural selection</u> had led to the gradual accumulation of adaptations that fit populations to the environment.
Explanation:
Emergent properties- Properties that is exhibited by a group of individuals as a result of interaction among them.
Evolution- the process by which populations develop new characteristic and become more efficient than their ancestors.
Natural selection- A phenomena in which only fittest organisms of a population are allowed to survive in a given environment. This play a key role in evolution.
A spirogyra is a filamentous chlorophyte green algae. A well-labelled diagram of spirogyra is attached.
Explanation:
The presence of hellical or spiral arrangement of chloroplast makes it from the order Zygnematales of Zygnematacae family of Algae.
It is commonly found in fresh and stagnant water.
A mucilaginous outer covering makes it slimy in texture.
It is a green algae hence undergo photosynthesis and is autotroph.
It can reproduce both sexually and asexually.
S-phase
S-phase is the part of the cell cycle in which DNA is replicated, occurring between G1 phase<span> and G</span>2 phase<span>. Precise and accurate DNA replication is necessary to prevent genetic abnormalities which often lead to cell death or disease.</span>
