The cell membrane is selectively permeable, allowing only certain substances to pass through. Passive transport is a way that small molecules or ions move across the cell membrane without input of energy by the cell. The three main kinds of passive transport are diffusion, osmosis, and facilitated diffusion.
Answer:
Have different numbers of neutrons
Explanation:
Isotopes of an element have different atomic numbers because thy differ in neutron number even though proton number remains the same across the isotopes. The mass number is the summation of the proton and neutron number. Phosphorus has approximately 23 isotopes whose mass number range between 25 and 47. Only ³¹P is stable.
Answer:
Sedimentary rocks are rocks that are formed by sediment accumulation, which are particles of various sizes that are transported by water, ice or wind, and are subjected to physical and chemical processes (diagenesis), which give rise to materials consolidated.
Explanation:
mentary rocks can form on the banks of rivers, at the bottom of ravines, valleys, lakes, seas, and at the mouths of rivers. They are disposed in layers or stratums.
There are external geological processes that act on pre-existing rocks, these agents weather them, transport and deposit them in different places depending on the transport (water, wind, ice). Similarly, different animal or plant organisms can contribute to the formation of sedimentary rocks (fossils). Sedimentary rocks can exist up to a depth of ten kilometers in the earth's crust. These rocks may appear loose or consolidated, that is, they have been joined to others by post-sedimentation processes, known as diagenesis.
The sedimentary rocks cover more than 75% of the earth's surface, forming a sedimentary cover that lies on igneous rocks and, to a lesser extent, on metamorphic ones.
Answer:
most at of earth s water is salt water found in oceans
The most appropriate answer is Muscle tension.
Biofeedback is a technique where a psychologist uses visual or auditory feedback to gain control over involuntary bodily functions. these may include gaining voluntary control over things such as heart rate, muscle tension, blood flow, pain perception and blood pressure.