Astronomers can detect X-rays coming from the hot gas and infer that a black hole is present.
B. replaced
C. preserved
D. bonded
Answer:
Receptors
Explanation:
The cell membrane has receptors integrated or embedded into to it known as Membrane receptors or trans-membrane receptors . Membrane receptors are specialized proteins and act in cell signalling by receiving extracellular molecules by binding to them.
In multi-cellular organisms cell signalling allows speciation o groups of cells and when the signal is released the membrane receptors are the ones that will receive it.
Answer:
The law of mass action and molecular concentration
Explanation:
Law of mass action: According to this law, the rate of chemical reaction is directly proportional to the masses of the reacting substance, at a constant temperature.
Molecular concentration: It is no of moles of solute dissolved in a liter of solution. No of molecules of reactants increases when we increase the molecular concentration of the reactant, which in turn increases the frequency of collision and hence the rate of reaction and direction.
Answer:
All statements except "D). Meiosis occurs often because it allows growth and repair of body tissues in multicellular organisms" describe the advantages of meiosis.
In multicellular organisms, growth and repair of the tissues are achieved by mitosis.
Mitosis is the process in which parent cell divides into two daughter cells each with the same and an equal number of chromosomes as present in the parent cell.
It helps in producing new cells and replacing the old or damaged cells.
It generally takes place in all the cells of the body (somatic cells) except germ cells.
Answer:
d
Explanation:
A flowing-water ecosystem supports little plant life at its source due to factors like minimal silt accumulation and shading. As the ecosystem flows downstream, organic material and nutrients support a food chain and adaptations enable survival and growth of organisms like leeches and trout.
The flowing-water ecosystem often supports little plant life at its source due to several factors. The fast-moving water results in minimal silt accumulation, making the water clear and inhibiting the growth of phytoplankton. The presence of tree cover and shading also keeps temperatures lower, further reducing photosynthesis.
As the ecosystem flows downstream, changes occur that support more organisms. Organic material and nutrients from leaves and other plants that fall into the water provide an additional source of energy. When the leaves decompose, the nutrients are returned to the water, supporting a food chain of invertebrates, which are then preyed upon by fish and other predators. Adaptations are also seen in organisms, such as leeches and freshwater trout, to survive and thrive in the fast-moving and colder waters.