All organisms contain DNA, and every organism's DNA is made of the same four nucleotides. The differences between organisms is simply based on the order of these nucleotides. Since all organisms have the same basic, universal structure for DNA, which of these must also be universal? A) All organisms have the same proteins. B) All living things must have the same amount of DNA. C) All organisms must be genetically identical to each other. D) All codons in all organisms' DNA code for the same amino acids.

Final answer:

Oxygen and carbon dioxide pass through the plasma membrane by simple diffusion, a process of passive transport that moves these gases down their concentration gradient. Certain other substances rely on facilitated transport, another type of passive transport, to cross the membrane.

Explanation:

Oxygen and carbon dioxide pass through the plasma membrane by simple diffusion. The structure of the lipid bilayer, composed of hydrophobic phospholipids, allows small, uncharged molecules such as oxygen and carbon dioxide to diffuse down their concentration gradient. This process is a form of passive transport, meaning it doesn't require energy input from the cell.

When there is a higher concentration of oxygen or carbon dioxide outside the cell than inside, these gases will naturally diffuse across the membrane, moving from an area of higher concentration to an area of lower concentration. The same concept applies when there's a higher concentration of these gases inside the cell; they will diffuse out of the cell into the extracellular fluid where their concentration is lower.

Also note that some polar substances and other molecules that do not easily pass through the membrane rely on facilitated transport. This is another type of passive transport where specific integral proteins or glycoprotein receptors on the cell membrane help these substances cross the membrane down their concentration gradient.

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Answer:

B. a fox

Explanation:

A secondary consumer is those that, to produce energy, consume primary consumers. Those are always herbivores or organisms that only eat autotrophic plants.

In this case, a rabbit and a cow are primary consumers.

The mouse is herbivores too.

The only option left is Fox.

Foxes eat other animals, they are carnivorous. This made the fox a secondary consumer.

It depends on the nature of the crime. There could be foot marks there, or a certain of material found that is usually not found. There could be blood stains, or some genetic samples that could provide for DNA testing. There could be certain chemicals that could lead to identification of the substance used in the crime.

Answer:

You could find any number of things...shoe prints and maybe some tire marks.  You might find shell casings, blood, broken glass, dropped items, etc.  Some of these could be individual characteristics like the shoe prints, blood, or tire marks.