Answer: A. Carbon Dioxide
Explanation: This happens because the coal or oil burning process combines carbon with oxygen in the air to make CO2
Echinoderms, like chordates, are deuterostomes and are therefore thought to be the most closely related of the major phyla to the chordates
<span>Both protexts the organisms' organelles which are inside the cell.
Animal Cell: Cell Membrane
Plant Cell: Cell Wall
Cell
wall is present only in plants, it is not found in all organisms.
Compared to the cell membrane, a cell wall is thick and has a rigid
structure. You can see it in a light microscope, because it is visible.
It serves as the protective cover that surrounds the plasma membrane in a
plant cell. Cell membrane is composed of lipids. Cell walls can be made
up of cellulose or peptidoglycan or chitin.<span> </span></span>
Answer:
The correct answer is A. The larynx moves up against epiglottis when food is swallowed to prevent passage of food into it.
Explanation:
The epiglottis is a moist, cartilaginous structure that is part of the cartilaginous skeleton of the larynx. It also marks the boundary between the oropharynx and the laryngopharynx. The epiglottis obstructs the passage of the bolus at the time of swallowing preventing it from going to the respiratory system.
Larynx closure occurs when the vestibular and vocal folds approach the midline during swallowing. Occasionally, when you eat very fast, solid foods or liquids can enter the larynx.
Answer:
Six hours
Explanation:
Given that;
A microbiologist inoculates a flask of broth with 1 ml of 100 bacterial cells/ml
Also, the generation time of the species is 1 hour and there is no lag phase
i.e there is no period where the individual bacteria are maturing, this will enhance a faster replication
So , since the generation time is 1 hour and we are being given 100 bacterial cells/ml
∴
After 1 hour = replication of the bacterial cells would have been doubled to =200 bacterial cells
2nd hour = 400 bacterial cells
3rd hour = 800 bacterial cells
4th hour = 1600 bacterial cells
5th hour = 3200 bacterial cells
6th hour = 6400 bacterial cells
∴ We can see that at the 6th hour, the culture has contained more than 6,000 cells/ml
