Isotopes
Atoms of the same element; number of protons remain the same, number of neutrons vary. Chemical properties remain the same. Atomic mass varies.
Na sodium with 11 neutrons = atomic mass of 22
With 22 neutrons the mass is 23.
Both have 11 protons in the nucleus.
Answer: The correct answer is macrophages
Explanation:
Macrophages are examples of phagocytes, and they engulfs pathogens (disease-causing organisms such as viruses, bacteria) by pulling them into their vacuoles and digesting them completely.
Macrophages, and Other like T-cells, B lymphocytes and natural killer cells all help in the BODY DEFENCE. But unlike macrophage, others exert their function through a different mechanism.
Answer:
d. blood moves from the heart into arteries and into smaller vessels and then back into larger vessels as it makes its way back to the heart.
Explanation:
A closed circulatory system is a system in which blood is separated from the interstitial fluid as it circulates in the blood vessels. In a closed circulatory system blood circulates in one direction that is from the heart and then then returns to the heart again after circulating around one of two routes of circulation. A closed circulatory system can be observed in vertebrates, annelids, mollusks.
Answer:
sympatric
Explanation:
Speciation is the process by which new species originate and there are several mechanisms and processes by which speciation can take place.
When speciation occurs in a common geographical area where there are no barriers preventing the mating of species and the members of the species lie in close proximity to one another however, even in such conditions new species arise because of some differential characteristics. Such a speciation is termed as sympatric speciation.
In the given situation, the individuals that undergo genetic doubling get reproductively isolated from the original population because of incompatibility to mate even though they have close proximity with each other.
Therefore, the new species of evening primrose have arisen due to sympatric speciation.
The restraints are used to keep the child from damaging the operative area. Elbow restraints are usually used post operatively in infants in order to protect the surgical area from damage. The restraint will limit the baby's movement and prevent him from accessing the area of the body that was operated.
