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Karolina [17]
3 years ago
5

Why does a vestigial pelvis show that the ancestors of the modern whale once had legs?

Biology
1 answer:
OleMash [197]3 years ago
7 0
The research party began by exploring the embryonic development of whales' cousins, the dolphins. These creatures are intriguing because, for a brief time during development, they sprout hind limbs . That's why dolphins lose their 'legs'.” In whales, however, the story is more complex.
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Excitatory postsynaptic potentials (EPSPs) produced nearly simultaneously by different synapses on the same postsynaptic neuron
lakkis [162]

Answer: summation

Explanation:

The process which determine if an action potential will be generated or not depends on the combined effects of the signal inputs from multiple sources of  synapse or from the repeated signals from the same synapse.  

If the input signals reach the threshold voltage, action potential will be generated. (all –or –none principle).Therefore, this  process is a determinant of  the likelihood of action potential generation  and it is called summation.

Summation is the ability to integrate multiple PSPs at multiple synapses.it is  the process that determine if an action potential will be generated by combined effects of inhibitory or excitatory  signals.

Based on the pathways and voulme of applied stimuli in the presynaptic neuron;

The signals can be temporal summation ( consecutive  signals  produced from the same  synapse)where action potential of high frequency in the PSN generated action potential in the post synaptic neuron, which summate with one another. Or Spatial where signals inputs are from multiple presynaptic cells.

3 0
3 years ago
Most drugs that inhibit the synthesis of the cell wall act by
lukranit [14]

Answer:

a. preventing the cross-linkage of NAM subunits

Explanation:

The bacterial cell wall is made of peptidoglycan which is a polymer of alternating  N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) residues. The NAM residues  are crosslinked to impart additional strength to the cell wall.

Most of the antibiotics that target the cell wall synthesis in bacteria inhibit the enzyme of transpeptidation which in turn cross-links the NAM residues of the polysaccharide chains of the bacterial cell wall. Examples of these antibiotics include penicillins and cephalosporins.

8 0
3 years ago
PLEASE HELP !! ILL GIVE BRAINLIEST *EXTRA 40 POINTS* DONT SKIP :(( .!
ivann1987 [24]

Hello there!!!

I'm inclined to think that the answer is A. These are products, so they can't really be reactants (unless the equation is reversible, which this is not). Cellular respiration is the process of the cells releasing the waste that they do not need. So A seems to be the logical choice.

Does this help you?

4 0
3 years ago
If an f1 plant is backcrossed to one of the pure-breeding parental plants, what is the expected ratio of phenotypes among progen
Ad libitum [116K]
C. F1 generation is all Yy (let Y be yellow and y be green). Y is dominant to y. The F2 could be YY, Yy, Yy, or yy.        3:1
5 0
3 years ago
What is the complementary RNA sequence for the following DNA sequence? <br> DNA- CCG ATT AAT
ANTONII [103]

Answer:

Fruintg beach ash crusty suk my fat crocks

Explanation:

Gay

8 0
3 years ago
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