The midrib of a leaf

(a) contains the midvein.
(b) contains only xylem.
(c) is part of the spongy mesophyll.
(d) contains only phloem.


(a) contains the midvein.

Biology & Microbiology

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Explain how radiometric dating allows scientists to determine the age of a particular fossil

What will be an ideal response?

Biology & Microbiology

Which epidermal cell produces the pigments that lead to the coloration of the skin?

a. Collagen fibers b. Keratinocytes c. Melanocytes d. Stratified squamous epithelium e. Elastin fibers

Biology & Microbiology

The figure represents the development of ____

in eukaryotic cells. a. the nuclear envelope b. mitochondria c. chloroplasts d. Golgi bodies e. chromosomes

Biology & Microbiology

An ecologist samples the abundance of various species along an environmental gradient and fails to find clusters of species. Instead, peaks of abundance of dominant species are merely randomly spaced segments along a continuum

This distribution of species supports the A) unified concept of a community. B) organismic concept of a community. C) individualistic or continuum concept of a community. D) successional concept of a community.

Biology & Microbiology