Which of these cells of the dermal tissue of plants prevent water loss and control gas exchange?

o phloem cells

O companion cells

O parenchyma cells

guard cells

Carbohydrates monomers are?

When is the preparation of a wet mount slide for observation appropriate?

The nervous system determines the pitch of a tone by

How many letters of mRNA code for an amino acid?

Which of the following is the major positive ion outside cells? A) nitrogen B) hydrogen C) potassium D) sodium

Produces gametes used in sexual reproduction

By definition for osmosis to occur the membrane separating two compartments

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If you follow the longest food chain in the food web below from grass to owl, how many trophic levels are there? grass aspen grasshopper rabbit-fox frog #snake owl o A. Three B. Five C. Four D. Two

What's the meaning of diagnoses