Answer:
Biogeography, the study of the geographical distribution of organisms, provides information about how and when species may have evolved. Fossils provide evidence of long-term evolutionary changes, documenting the past existence of species that are now extinct.
To give one classic example, the forelimbs of whales, humans, and birds look quite different on the outside. That's because they're adapted to function in different environments. However, if you look at the bone structure of the forelimbs, you'll find that the organization of the bones is remarkably similar across species. It's unlikely that such similar structures would have evolved independently in each species, and more likely that the basic layout of bones was already present in a common ancestor of whales, humans, and birds.
To be more correct, the left side is alkali metals
The answer would be: <span>A.50%
A child will get genetic material from both parents, half from the father and half from the mother. This is why the gamete cells (sperm/ovum) are made from meiosis and only have 50% of the original genetic material.
</span><span>In this case, the parent carries a deletion on one of the two homologous chromosomes. Since the gamete only has one of the chromosomes, half of the gamete of this parent would have the defective chromosome and the other half have a normal chromosome. So, the chance for the child to inherit the defective gene is 50%.</span>
The correct answer is GABA.
GABA is a neurotransmitter, which functions by shielding certain impulses fired between nerve cells in the brain. Low level of GABA result in chronic pain, anxiety, epilepsy, sleep disorder, etc. Alcohol and GABA have similar effects on the brain, because alcohol is an agonist of GABA receptors, that is, alcohol has the capacity to bind to some brain GABA receptors and produce the same effects as that of GABA. This action increases the amount of dopamine and serotonin that is released into the brain leading to production of pleasurable feelings and emotions. Continuous exposure of GABA receptors to alcohol over a long period of time will lead to insensitivity of the GABA receptors and ultimately to alcohol addiction.
