As with all organic molecules, carbon forms the backbone of the molecules that comprise plant tissue. This carbon comes from
A. the soil, and was taken up through the plant's roots.
B. the organic molecules produced by aerobic cellular respiration.
C. the atmosphere as CO2.
D. the splitting of water molecules.
C. the atmosphere as CO2.
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Which of the following is true concerning the life cycle of a moss?
a. Gametophytes are nutritionally dependent upon sporophytes. b. Emerging gametophytes arise from germinated spores. c. The zygote is protected within specialized tissues of the sporophyte. d. Spores are produced within reproductive bodies called antheridia.
Explain why individuals with cystic fibrosis have different levels of severity of the disease
What will be an ideal response?
In the heart of Costa Rica there's a private reserve called Rara Avis. Here, one can hike high into the mountains of a tropical cloud forest to take guided nature hikes and learn about this unique ecosystem
What principle applies to this tactic of habitat preservation? A) critical habitat designation B) ecotourism C) regulations D) exploitation
Which of the following is a common selective agent for natural selection?
A. mutations B. competition for food and other resources C. sex ratio D. population size