1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
IgorC [24]
3 years ago
7

A student has several pet hermit crabs. He wants to determine how the hermit crabs choose which shell they inhabit. He thinks th

at the crabs choose their shells based on the shells' color and wants to design an experiment to test this. Which of these steps should the student include in his experiment? A. He should add shells that are different colors, but the same size and type, to the tank and observe which shells the hermit crabs choose. B. He should observe hermit crabs in their natural environments and determine how shells help protect them from predators. C. He should place the hermit crabs in different tanks and change the temperatures in the tanks to see if it effects their shell selection. D. He should gather shells that are different sizes and different colors, place them in the tank with the hermit crabs, then observe which shells they choose. Reset Next Question
Biology
1 answer:
julsineya [31]3 years ago
7 0
A. He should add shells that are different colors, but the same size and type, to the tank and observe which shells the hermit crabs choose.

Durning an experiment you need to keep everything the same but only change the certain things based on your theory.
Such as how the student wanted to see if the color attracted the crab. If he had changed the size and type of the shell then the crab would have chosen the bigger one as they tend to grow into larger shells.
You might be interested in
Give one example of an extrinsic homeostatic mechanism overriding an intrinsic homeostatic process.
NeTakaya

Answer:

Extrinsic regulatory mechanisms are external and depend on the firing of some factor outside the population itself. Among them are interspecific competition, food and space restrictions, very strong climatic variations, weathering and inharmonious relationships with other populations (parasitism and predatism).

Good examples of interspecific competition appear when rabbits, caves, rats compete for the same plant, or different fish and birds, such as the heron, vie for the same species of smaller fish. This is because these different species keep their populations in the same ecological niche. Competition is often so strong that some species eventually, as one example of an extrinsic homeostatic mechanism overriding an intrinsic homeostatic process is their disappearance or migration to other regions.

In this competition, the presence of adaptations among individuals in the population that promote better food search, speed, vision, and others can make the difference between elimination and survival.

8 0
3 years ago
Pollen contains the male gamete for plants.<br> What kind of cells are pollen cells ?
zhannawk [14.2K]

A Pollen Cell is called a Generative Cell

4 0
3 years ago
Read 2 more answers
Mercury pollution in a local lake can be traced directly to a factory located near the lake's shore. What type of pollution is t
olga2289 [7]
It would be Primary because the lake is it’s starting point and the pollution grew all the way to the factory.
3 0
3 years ago
How did eukaryotic cells originate?<br>​
yulyashka [42]

Answer:The hypothesis that eukaryotic cells evolved from a symbiotic association of prokaryotes—endosymbiosis—is particularly well supported by studies of mitochondria and chloroplasts, which are thought to have evolved from bacteria living in large cells.

Explanation:

7 0
3 years ago
What are the number of vertebrae in each section of the vertebral column
mars1129 [50]

Answer: the vertebral column is made up of 5 sections of individual bones. There are 7 cervical vertebrae, 12 thoracic vertebrae, 5 lumbar vertebrae, 1 sacral bone and the coccyx

Explanation: .

6 0
3 years ago
Other questions:
  • In psychology, the term nature refers to traits that are a result of ___.
    7·1 answer
  • A mutagen is
    11·2 answers
  • The fossil record resembles the living species in the same geographic area. how does this pattern support the theory of evolutio
    13·1 answer
  • What is cardiorespiratory endurance?
    8·2 answers
  • Women readily develop lower body fat around the hips and thighs and men readily develop central body fat around the abdomen. Thi
    8·1 answer
  • Some steps in mitosis are shown below. They are not in order.
    14·2 answers
  • Suppose the producers in a certain ecosystem are dying out because there is a lack of nutrients in the water and soil. What is t
    10·1 answer
  • Which best describes how DNA fits inside a cell nucleus?
    8·2 answers
  • How does a water wheel do work (NOT how does water do work on a water wheel)?
    6·1 answer
  • Autoimmune diseases occur when the immune system fails to recognize and tolerate ____________ antigens.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!