Answer:
A
Explanation:
it takes the energy from light and turns it into food
Answer:
The correct answer is: Electrical impulses in the heart cause the muscles to contract.
Explanation:
The heart contracts thanks to a series of electrical impulses that travel through the muscles of this organ. The electrical impulse begins in the SA (sinoatrial) node and is transmitted to the muscles that conform the left and the right atria to produce their contraction which will make the atria pump the blood to the ventricles. When the electrical impulse reaches the AV node and then the Bundle of His, this information will transmit to both ventricles and will produce their contraction as well.
The only muscle tissue capable of stimulating their own contractions is the muscle in the heart, the myocardium, thanks to the existence of "pacemaker cells" that are located in the SA node.
The waves in the ECG represent the depolarization of the atria, depolarization of the ventricles, and repolarization of the ventricles.
Answer:
adaptations are compromises
Explanation:
The pleiotropic gene involved in sickle-cell anemia is an example of heterozygous advantage. This means that the heterozygous genotype is favourale over other two genotypes (recessive homozygous and dominant homozygous). Eventhough it has harmful effect (sickle cell disease carrier) heterozygous genotype enables resistance to infection (malaria) and that is why this genotype is still favourable by natural selection. This phenomenon is evidence of compromise between harmful ad benefit.
Answer:
1,000,000s
Explanation:
A micrometer (μm) is equal to 1 x 10⁻⁶ m
This means that 1 m = 1 x 10⁶ micrometers or 1,000,000 μm.
You can calculate the time it would take using the formula:
So based on the formula above, you can derive the formula for time which will be:
Distance = 1m or 1,000,000 μmeters
Velocity = 1μm/s
We just plug it into our formula:
Molecule is formed when atoms are joined together by covalent bonds.
Molecule is a combination of similar type of atoms, whereas, compound results by the combination of 2 or more different atoms or different molecules.
