Answer:
It is both a barrier keeping unwanted things out, and a gate for nutrients to be brought in.
A biotic factor is the living part of an ecosystem, to thr answer will be plants.
Answer: Option D.
Explanation:
Active transport is defined as the transfer of molecules and other substances across a membrane from lower to higher concentration against the concentration gradient. Active transport utilizes Adenosine Triphosphate (ATP) as a energy source for the continuous movement of molecule against its concentration gradient.
Active transport function continuously because constant process of diffusion allows the movement of solutes in other direction.
For example cells are having higher concentrations of potassium (K+) and lower concentrations of sodium (Na+) in comparison to extracellular fluid. concentration gradient supports diffusion of Na+ ion into the cells and diffusion of K+ out of the cell. In such manner other small substances like glucose and amino acid constantly move across the plasma membranes and maintains concentrations of ions and other substances required for the body.
Hence, the correct option D.
14) loss of sensory perception due to the effects of uncontrolled diabetes is termed: diabetic neuropathy.
Without proper sensation to extremities like the foot shown, the person may not feel an injury to the skin or may allow blood circulation to be cut off, without feeling that something us wrong down there. Over time, without properly inspecting the feet, such an injury could lead to tissue death, infection, and necrosis/gangrene.
29.D
30.A
31.C
32.A
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