In an experiment to test the hypothesis that added phosphate will cause marigolds to produce more blooms, the experimenter has two groups of pots planted with marigold seeds. One group gets watered with phosphate added to the water, while the other group gets watered with no phosphate. Both groups get the same amount of water and light.Which is a controlled variable in this experiment?
A. number of pots
B. amount of water
C. amount of phosphate
D. amount of blooms on a plant

Answers

Answer 1

Answer:

Answer: B. amount of water.

Explanation: Controlled variables are those that remain constant in an experiment in order to avoid misconclusion about the relation between the dependent and independent variables.

Dependent variables are those that rely on other variables and independent variables are the ones that the experimenter controls.

In this case dependent variable is the production of blooms because depends on how much phosphate is added, so independent variable is the amount of phosphate.

Control variable is amount of water because it affects the growth and production of plants but when the experimenter use the same amount in both trials is standarizing the effect and making non-relevant to the study.

Answer 2

Answer: C. Amount of phosphate
I am not really sure, but I know that a controlled group is when nothing is changed to that group, so I am thinking that the amount of phosphate is the controlled variable because one groups gets some while the other does not.

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in all organisms, genetic information (dna) that has been transcribed into rna is then translated in ribosomes. which of the following explains why this process occurs in all organisms? (4 points) organisms share similar dna sequences, so the process for decoding them is the same. organisms all have the same types of cells, so their organelles all carry out the same functions. organisms self-replicate, and they all carry out the process in the same manner. organisms share a common ancestor, so they also all share core life processes.

Answers

Answer:

Organisms share a common ancestor, so they also share Co life processes.

If the birth rate is 10 per 1,000 and the death rate is 10 per 1,000,then the growth rate is A.20%
B.10
(C.0%)
D.100%

Answers

Answer: C. 0%

Explanation:

Birth Rate is the fraction of the number of babies born every year per 1000 individuals in a population.
Death Rate is the fraction of the number of deaths every year per 1000 individuals in a population.

Given: The birth rate = 10 per 1,000

The death rate = 10 per 1,000

Since the birth rate and the death rate both are same then there is no change in the population.

Therefore , there must be zero percent population growth or decay.

If the birth rate is 10 per 1000 and death rate is rate is 10 per 1000 then the growth rate is C 0

A bird's wings are homologous to:a. an alligator's claws.
b. a fish's tail fin.
c. a dog's front legs.
d. a mosquito's wings.

Answers

A bird's wings are homologous to a dog's front legs. Thus option C is correct.

what is homologous structure ?

Homologous structures shows the same structure, but may have a different function or same function.

Homologous structures have a common ancestor, this structure is an organ or bone that's in common between different animals that demonstrates an anatomical structure indicating that the animals share a common ancestor.

This is in contrast to analogous structures where two unrelated animals have structures with similar forms or functions due to convergent evolution.

For more details regarding homologous, visit

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A bird's wings are homologous to c. a dog's front legs.

WORD BANK HELPword bank: crossbreed , varieties , characteristics , artificial selection , domesticated

Selective breeding ( also called {blank }) is the process by which humans use animal breeding and plant breeding to selectively develop particular phenotype traits (blank) by choosing which typically animal or plant males and females will sexually reproduce and have offspring together. (blank) animals are known as breeds , normally bred by a professional breeder , while domesticated plants are known as (blank) , cultigens , or cultivars. Two purebred animals of different breeds produce a (blank). Flowers , vegetables and fruit-trees may be bred by amateurs and commercial or no-commercial professionals: major crops are usually the provenance of the professinonals.

Answers

Selective breeding (also called artificial selection) is the process by which humans use animal breeding and plant breeding to selectively develop particular phenotypic traits (characteristics) by choosing which typically animal or plant males and females will sexually reproduce and have offspring together. (Domesticated) animals are known as breeds, normally bred by a professional breeder, while domesticated plants are known as (varieties), cultigens, or cultivars. Two purebred animals of different breeds produce a (crossbreed). Flowers, vegetables and fruit-trees may be bred by amateurs and commercial or non-commercial professionals: major crops are usually the provenance of the professionals.

Answer Key

Selective breeding also called (artificial selection.) is the process by which humans use animal breeding and plant breeding to selectively develop particular phenotypic traits (characteristics.) by choosing which typically animal or plant males and females will _exually reproduce and have offspring together. (Domesticated.) animals are known as breeds, normally bred by a professional breeder, while domesticated plants are known as (varieties.) , cultigens, or cultivars. Two purebred animals of different breeds produce a (crossbreed.) . Flowers, vegetables and fruit-trees may be bred by amateurs and commercial or non-commercial professionals: major crops are usually the provenance of the professionals.

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Answers

I think it can be C or D. But I think it's D.

Biology and geology are two very different sciences, but biologists and geologists use scientific knowledge in the same way. These scientists both use scientific knowledge to_______. A. answer questions and solve problems affecting the natural world. B.investigate the chemical composition of the Earth’s different layers. C.observe and classify living organisms into groups. D.explain the rituals and traditions of human cultures.

Answers

The question is asking us to continue the sentence in: Biology and geology are two very different sciences, but biologists and geologists use scientific knowledge in the same way. These scientists both use scientific knowledge to... First, Geologists don't work with humans specifically, so we can reject answer D) Similarly, we reject answer B because it's only geologists who investigate Earth's different layers. Option C is again only true for one of the groups: the biologists! So the correct answer is A. answer questions and solve problems affecting the natural world.

The answer is A 5 stars and thanks plss.......

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