BIOLOGY HIGH SCHOOL

Nancy visits a local reservoir where she feeds ducks and other birds. Every time she feeds them she notices that they fight for the best pieces and some do not get any. All living things struggle to get the necessary amount of food, water, and shelter. What is the term for this struggle?A. overproduction
B. natural selection
C. variation
D. competition

Answers

Answer 1
Answer: i think its competition

Related Questions

During cellular respiration, the bonds of food molecules are broken, so energy can be released to fuel other cellular processes. In order for this to occur, which of the following statements must be true?A.) The energy in the new compounds that are formed must be equal to the energy in the bonds of the food molecules.B.) New compounds with lower-energy bonds must be formed when the high-energy bonds in food molecules are broken.C.) New compounds with higher-energy bonds must be formed when the low-energy bonds in food molecules are broken.D.) The new compounds that are formed must be more complex than the food molecules that were broken down.
Which food does NOT support progressive bacterial growth?a. Cooked potatoes. b. Uncooked rice c. Cut watermelon. d. Cooked beef.
If the DNA sequence TTCACG is transcribed to AAGGC, what type of mutation has occurred?a. Insertion b. Substitution c. Translocation d. Deletion
Succession occurs when environmental factors affecting an ecosystem change. True or False
What aspects of the genome can and cannot be determined through karyotyping?

Which statement describes how water is pulled up through the xylem to the leaves of the plant? As water exits the leaf, hydrogen bonding between water molecules pulls more water up from below. A As water exits the leaf, signals are sent to the roots to pump more water up to the leaves through the xylem by adhesion. B Evaporation from the leaf decreases the hydrogen bonds that form between the water molecules in the xylem, which helps the water molecules to be pulled up the xylem. C Evaporation of water from the leaf increases the hydrogen bonds that form between water molecules in the air, providing the energy for transport.

Answers

Final answer:

The movement of water in plants from the roots to the leaves is driven by transpiration, which creates a tension pulling water upwards. This process, as well as the water's cohesion and adhesion, and differences in water potential, is explained by the cohesion-tension theory.

Explanation:

The movement of water in plants, specifically from the roots to the leaves, is primarily driven by a process known as transpiration. Transpiration is the evaporation of water from the plant's leaf surfaces. This occurs at the leaf-atmosphere interface, creating a negative pressure or tension which effectively pulls up water from the roots, through the xylem vessels.

Adherence of water to the xylem cell walls, known as adhesion, and the attraction between water molecules themselves, known as cohesion, also play significant roles in this process. These factors permit the water to be held in the stem and leaf when transpiration stops at night as the stomata shut. Overall, this process of water movement is described by the cohesion-tension theory of sap ascent.

Water potential, at the same time, affects this process as it decreases from the roots to the top of the plant, meaning, there's a high water potential in the soil and roots and a low potential in the leaves, driving water upwards through the plant.

Learn more about Transpiration here:

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If trypsin and chymotrypsin become activated within the pancreas and then are released in their active forms into the bloodstream, why would this represent a potentially life-threatening situation?

Answers

function of trypsin and chemotrypsin:
 these are digestive enzymes present in pancreatic juice and they perform process of proteolysis mean protein break down...
why they are dangerous in blood stream:
as they digest proteins so when they go into blood they can digest all proteins present in blood (like albumin etc) that are very important to carry certain processes..
 

Most oceanic gas hydrates are created when _____ breaks down organic matter trapped in ocean-floor sediments

Answers

Most oceanic gas hydrates are created when bacteria breaks down organic matter trapped in ocean-floor sediments  


I hope that's help !

Most oceanic gas hydrates are created when bacteria breaks down organic matter trapped in ocean-floor sediments.

i knew this without looking at the answer

i hope i helped though

Spawning is when aa. large group of adults release their gametes into the water at the same time.
b. male and female fish release their gametes together.
c. male fertilizes the females eggs.
d. a group of eggs develops into larvae.

Answers

The answer is (b.) male and female fish release their gametes together.

A change in a sequence of DNA bases in a bacterial cell has resulted in a mutation. This mutation has increased the ability of the bacteria to break down and digest organic molecules in the environment. Bacteria with this mutation are better able to find and utilize food sources. According to the theory of natural selection, what is MOST likely to occur in future generations of this bacteria?A)The relative frequency of the mutation will increase as time passes.
B)Because the mutation has changed the DNA of the bacteria, a new species will be formed.
C)Because the mutation is abnormal, the mutation will become more rare with every passing generation.
D)Bacteria with the mutation will increase in number until the food supply is exhausted, causing the bacteria to become extinct.

Answers

The answer is A) The relative frequency of the mutation will increase as time passes. 

In natural selection, genotype variations that will increase the chance of survival and reproduction of some organism are preserved and will be inherited. So, the mutation could not be abnormal, since it helps bacterial survival. Also, the bacteria will not extinct because of this mutation nor the new species will be formed since this is not so big mutation.
This leaves A) as the right answer. The relative frequency of the mutated allele will increase since the more bacteria with the mutation will survive and it will be passed down to the new generation over time.

The distinction between protostomes and deuterostomes is based on differences in theira. nervous systems.
b. embryological development.
c. circulatory systems.
d. digestive tracts.

Answers

The answer is B- Embryological Development.
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