Enzymes because they are proteins that act as catalysts within living cells. Catalysts increase the rate at which chemical reactions occur without being consumed or permanently altered themselves.
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If she spent $42.15 on dinner it does not matter that this is half.
The equation should be: x-42.15

20
I hope that this is the answer that you are looking for.
The blood is filtered at a high pressure and the kidney selectively reabsorbs any useful materials such as glucose, mineral ions and water. After it has been purified, the blood returns to the circulatory system through the renal vein. The kidneys produce urine and this helps maintain water balance.
We can use a punnett square to predict the outcome of self-fertilization for the f1 hybrids of a monohybrid cross. In this case, the punnett square should be set up as a blank 2x2 square.
Self-fertilization is the joining of male and female gametes and/or nuclei from the same haploid, diploid, or polyploid organism. It is an instance of extreme inbreeding. These are 2X2 squares with four boxes for a monohybrid cross, with each box signifying a fertilization between the parent gametes.
Selfing is widespread, ranging from simple hermaphrodite plants and animals to multicellular organisms (especially invertebrates). Selfing occurs when two individuals (or their cell nuclei) that were produced by a previous mitotic division of the same individual interbreed in unicellular organisms like protozoa.
The Punnett square is a table that lists every conceivable result of a genetic cross between two people of known genotype. The Punnett square is a square that has been partitioned into four quadrants in its most basic form.
To learn more about the punnett square, here
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1. The ability to maintain consistent conditions inside an organism, eg temperature regulation
2. The process of producing new organism with only one parent
3. The smallest unit of life, what all living things are/are made of
4. A stimulant is a change in conditions and response is how an organism reacts to the change, eg touching a hot pan and pulling your hand away