Which of the following organic molecules is used for chemical digestion? a. protein
b. fats and oils
c. nucleic acids
d. carbohydrates

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How do the sperm cells get from the stigma to the ovules? a. they slide down the petals to the bottom of the flower. b. they travel through pollen tubes. c. they travel along filaments. d. insects carry the sperm cells from the stigma to the ovules.

What is the next step in muscle contraction after the actin changes shape

Do you think humans have a moral obligation to preserve the habitat of the chimpanzee