BIOLOGY MIDDLE SCHOOL

Two methods of active transport

Answers

Answer 1
Answer: One method of the active transport is the bulk transport - using the endocytosis or exocytosis for the process of moving bigparticles through the membrane.
Another example would be with the use of special transport proteins in plasma membrane. These proteins to change their shapes thanks to ATP (Adenosine triphosphate).This is how they manage transport materials from low to high concentration.
Answer 2
Answer: Active transport methods:
- symport - across one protein, two molecules are transported in the same time and direction
- antiport - across one protein, two molecules are transported in opposite directions, which one enters into protein and one leaves it.

I hope I helped :D

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What are long periods of low precipitation called

Answers

droughts are periods of low rainfall
"drought" is what a long period of low precipitation

Which is a requirement for natural selection to occur?(a) heritable variations for some traits
(b) the ability of an organism to improve a trait during its lifetime
(c) equal probability of survival for all offspring
(d) fewer offspring than the environment can support

Answers

(c) equal probability of survival for all offspring

Natural Selection, Survival of the fittest favors the “fit” and adaptable to survive in the harsh and hostile environment. Organisms that has a Type 3 survivorship curves has high reproduction rate since it also has greatest mortality rate. And why does natural selection favor these type of organisms is because these organism first-handedly were able to “adapt”. The theories states that organism need to be adaptable to survive hence, their reproductive mechanisms were stimulated and improved with the awareness of the susceptibility and vulnerability of these type of species.   

Answer:

equal probability of survival for all offspring

Explanation:

edg 2020

How are a mold and a cast related?

Answers

The mold and the cast are related in that the mold is the object that makes the shape of the cast. Additionally they both hold the shape or part of an organism

When organisms are buried in sediment they may decay or dissolve away leaving a cavity or what we call mold, if the pace is filled with sediment, then an external cast is made. A mold fossil becomes a cast fossil when it is filled with sand or mud and hardens. A mold fossil can turn into a cast fossil, but a cast fossil cannot be a mold. 
. 
The mold is the object that makes the shape of the cast. The cast is what is formed after you put liquid into the mold.

3. Which of these substance has a brown color and isdetected by the spectrophotometer in our reaction?
A) Guaiacol
D) Tetraguaiacol
B) Peroxidase E) Hydrogen peroxide
C) buffer

Answers

Answer:

E) Hydrogen peroxide

Explanation:

Hydrogen peroxide is the substance that has a brown color and is  detected by the spectrophotometer in our reaction.

The beam of a light spreads out after leaving the flashlight. The beam grows wider and wider. This is best explained by

Answers

When you leave the flashlight power on, the beam of its light will grow wider and wider because the individual photon travels though space forever as long as it don’t hit anything. While the beam grows wider, the photons also spread thinner.

One theme from The Metamorphosis is that loneliness can make a person feel isolated from others. Which passage from the story best supports this theme?

Answers

The answer is D. Hearing these words from his mother made Gregor realise that the lack of any direct human communication, along with the monotonous life led by the family during these two months, must have made him confused — he could think of no other way of explaining to himself why he had seriously wanted his room emptied out.
id have to say B but im not 100% sure
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