Answer:
Mutations are random Mutations can be beneficial, neutral, or harmful for the organism, but mutations do not “try” to supply what the organism “needs.”
Explanation:
Answer:
Mass extinctions, like the one that killed the non-bird dinosaurs, leave behind a host of empty niches — unoccupied ecological real estate. The upshot of all these processes is that mass extinctions tend to be followed by periods of rapid diversification and adaptive radiation.
Explanation:
Answer:
1/2
Explanation:
let the alleles of the heterozygous woman without hemophilia be = Xhx
And the alleles of the man with hemophilia be XhY
If both XhY × Xhx; we have:
Xh Y
Xh XhXh XhY
x Xhx xY
XhXh and XhY are affected by the diseases
Xhx is a carrier
xY is normal
∴ the probability(chance) that their first child will have the disease is 2/4 of the total offspring
=1/2
∴ the probability (chance) that their first child will have the disease is 1/2
A neurotransmitter is defined as a chemical messenger that carries, boosts, and balances signals between neurons, or nerve cells, and other cells in the body. These chemical messengers can affect a wide variety of both physical and psychological functions including heart rate, sleep, appetite, mood, and fear. Billions of neurotransmitter molecules work constantly to keep our brains functioning, managing everything from our breathing to our heartbeat to our learning and concentration levels.
The continental crust is made mostly of rocks. Both oceanic crust and continental crust are less dense than the mantle, but oceanic crust is denser than continental crust. The mantle, oceanic crust and continental crust have different densities because they are made of different kinds of rock with different densities.<span> the oceanic crust is made mostly of rocks with a composition of basalt.</span>
