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Biology

Aria Ortega

What effect do calcium ions have on the water in ecosystems?

A. They reduce its pH.

B. They decrease its salinity.

C. They add to its hardness.

D. They increase its acidity.

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Biology

Yadiel Costa

How is the circulatory system controlled (i. e. hormonally, neurally) ?

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Biology

Randall Holmes

Most scientists come up with questions to investigate out of the blue

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Biology

Marley Anderson

What is true of charophytes? they are examples of seedless vascular plants. they are the closest living algal relatives of land plants. they share some features in common with land plants, namely spores surrounded by sporopollenin and alternation of generations. they are the ancestors of green algae?

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Biology

Nona

Which cell is the precursor of all types of blood formed elements?

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Biology

Malik Ward

What are the advantages of artificial selection?

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Biology

Elsie Santos

The intermediate stage between snow and glacial ice is called

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Biology

Emiliano Herring

Brothers, Patrick and Michael, do not look very much alike. Patrick has green eyes and blond, curly hair like his mother. Michael has blue eyes and dark brown, straight hair like his father. These directly observable characteristics are a) phenotypes. b) genotypes. c) chromosomes. d) DNA.

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Biology

Lina Kramer

What should you do if your experiment does not turn out as you expected?

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Biology

Camryn Mccormick

How can humans alter part of the water cycle? What effect will this have on the process as a whole?

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Biology

Monique Knapp

All three regions of the brain stem can be observed on the ventral surface of the brain. all three regions of the brain stem can be observed on the ventral surface of the brain.

a. True

b. False

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Biology

Jerome Roach

Which mineral is important for carrying o2 in the blood?

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Biology

Zachary Bates

Deanna explains to Wesley the different types of nitrogen in the nitrogen cycle. Choose the sentences that she includes in her explanation. Select all that apply.

A.

Bacteria fix nitrogen from ammonia gas.

B.

Nitrates in soil are taken up by plant roots.

C.

Nitrifying bacteria convert ammonia to nitrates.

D.

Herbivores eat plants to fix nitrogen gas from the air.

E.

Nitrogen is found as a metal in the soil after it is fixed by bacteria.

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Biology

Danielle

What are three key factors that contribute to a female primate's success at feeding?

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Biology

Daniela Garrett

You breathe in more oxygen than you breathe out. And you breathe out more carbon dioxide than you breathe in. What type of change is oxygen turning into carbon dioxide? A. physical only B. chemical only C. physical and chemical

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