about 3.9 billion years agoThe most recent common ancestor of all currently living organisms is the last universal ancestor, which lived about 3.9 billion years ago.

6 0

2 years ago

In a certain cat, long whiskers (W) are dominant and short whiskers (w) are recessive. Two cats have genotypes Ww and ww. If the

asambeis [7]

nope its ww so the answer is D.

8 0

3 years ago

Read 2 more answers

Amphetamine increase synaptic levels of serotonin because: a. it increases the activity of the VMAT b. it blocks COMT c. it incr

bija089 [108]

Answer:

The correct option is d. it causes exchange diffusion

Explanation:

Amphetamines are synthetic substances with a stimulating effect. Their action lies mainly in increasing synaptic levels of monoamines by various mechanisms, including diffusion exchange through membrane transporters. Amphetamine increases extracellular concentrations of serotonin by displacing the neurotransmitter from its specific presynaptic transporter. When amphetamine binds to serotonin transporters, on the one hand it prevents it from entering the terminal and on the other it reverses the recapture mechanism so that serotonin leaves the synaptic space.

8 0

3 years ago