The QRS complex causes the ventricles to contract. This has to happen before they can relax.
DNA replication must occur before cell division can take place. This process ensures that each new cell receives an identical copy of the genetic material to maintain genetic continuity.
DNA replication must occur before mitosis starts to ensure that each daughter cell receives a complete and identical copy of the genetic information. If DNA replication did not occur before mitosis, the daughter cells would have only half of the necessary genetic material, leading to genetic abnormalities and potentially cell death.
Before transcription can take place, the DNA in the cell nucleus must be unwound and separated into two strands by enzymes. This process exposes the genetic information that will be transcribed into mRNA.
For a marketing exchange to occur, there must be two parties involved - a buyer and a seller. Both parties must have something of value that the other party desires, such as a product or service. There must also be a communication channel through which the exchange can take place, such as advertising or personal selling.
For endometrial growth to occur, the hormones estrogen and progesterone must increase.
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The external urethral sphincter, a muscle that surrounds the urethra, must relax to allow the flow of urine out of the bladder and through the urethra. Relaxation of this muscle is controlled by the autonomic nervous system.
Transcription must occur .
the double helix must unwind
.Glycolysis
a reveiw of what is known about the subject must occur
two molecules must collied before diffusion happens.
Before condensation can occur, the relative humidity must be 100%. This means that the air is saturated with moisture and cannot hold any more water vapor, resulting in it condensing into liquid.
Repolarization
Evaporation and condensation
pollenseed
Fertilization