Answer:
Centrosomes and Lysosomes
Explanation:
Animal cells each have a centrosome and lysosomes, whereas plant cells do not. Plant cells have a cell wall, chloroplasts, and other specialized plastids, and a large central vacuole, whereas animal cells do not.
Answer:
The cells need water to maintain their metabolic functions, the way water enters through cells membranes is by osmosis.
Explanation:
The cell membrane is a lipidic bilayer composed of phospholipids and embedded proteins. Phospholipids have the characteristic of being amphiphilic which means that possess hydrophilic and lipophilic characteristics. The most common way is by osmosis, that is a mechanism that moves water from high concentration to less concentration of water. In the cell membrane, there are is channels of proteins called aquaporins that facilitate the pass of water through the membrane. Also, as water is a very small molecule without charge, this characteristic allows passing a limit amount of water molecules through the hydrophilic characteristic of membranes.
Thus the response above i.e., "Option b" is right.
Learn more about the grasshopper effect here:
Answer:
b. grasshopper effect
Explanation:
Persistent Organic Pollutants or POPs are organic chemicals that cause a lot of damage to environment and living beings. They are generally industrial chemicals or pesticides for example, DDT. They are toxic and not degraded easily. They tend to get accumulated in living tissues and increase in concentration as we move upwards in a food chain.
When POPs are transported to areas far from their original site, the phenomena is called as grasshopper effect. They are carried by wind in atmosphere and finally settle down on land from where they evaporate again to enter the atmosphere. Thus, the cycle continues. Eventually, they can reach to an area thousands of kilometers away from their original source.
Answer: The hairs trap a layer of air above the skin,
Explanation:
Answer:
wear bras and why you askin dat
Explanation:
A)
the moon revolving around the sun and Earth.
B)
Earth revolving around the sun and the sun's light being reflect off the moon.
C)
the moon revolving around Earth and the moon reflecting sunlight towards Earth.
D)
the moon revolving around Earth with sunlight reflecting off of Earth towards the moon.
In the 1950s, several key concepts related to DNA were well understood in the scientific community, such as the polymer structure of DNA, base pairing rules, and the helical structure of the molecule itself. The established methods like X-ray crystallography also contributed to their research.
In the 1950s, when Francis Crick and James Watson were working on their model of DNA, the scientific community had a well-established understanding of several key concepts. For example, it was well accepted that DNA is a polymer of nucleotides, each containing deoxyribose sugar, phosphate group, and one of four nitrogenous bases, A, T, C, and G; and that purines always pair with pyrimidines.
X-ray crystallography was an accepted method for investigating molecular structure. Chargaff's rules, which state that of the four types of nucleotides present in a DNA molecule, two were always present in equal amounts, were also widely accepted. Finally, it was known that the DNA molecule has a helical structure, thanks to the work of Rosalind Franklin.
#SPJ12