Answer:
Electrons are arranged in layers
Explanation:An atom is solid and the Nucleus is at the center of an atom+ it isn't possible for electrons to form layers
Answer:
Explanation:
they are identified by routinely morphological and biochemical tests
Dopamine is a chemical released by neurons to send signals to other nerve cells. the brain includes several distinct dopamine pathways, one of which plays a major role in reward motivated behavior.
smoking is a habit, in a habit there is the cue, routine, and reward. with smoking the cue can be different things, most commonly stress or anxiety. the routine how you react to those cues, the reward is the chemical 'triggers' that are pulled inside you're brain leaving you feeling calm, happy, or relieved, etc.
DNA is deoxyribonucleic acid while RNA is ribonucleic acid !
DNA has base pair of adenine guanine thymine and cytosine.....while RNA has adenine guanine cytosine and uracil !
DNA is always double helix while RNA is mainly single helix !
DNA contains genetic info for 99℅ of organism while RNA is being catalytic and unstable than DNA is only present as genetic information holder in 1℅ !
DNA does not involve in protein synthesis directly but RNA has to !
for more difference, comment !
Excitation-contraction coupling refers to the series of events that begins with the excitation of the sarcolemma in response to stimulation by a neurotransmitter, and results in the release of calcium ions from the sarcoplasmic reticulum.
Hence, option D is the 1st process that starts the excitation-contraction coupling.
