Which statement about seedless vascular plants is true?
a. Seedless vascular plants tend to thrive in moist environments.
b. Liverworts and horsetails are seedless vascular plants.
c. Ferns are the earliest group of seedless vascular plants.
d. Seedless vascular plants absorb nutrients through exposed surfaces.
a. Seedless vascular plants tend to thrive in moist environments.
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The site of new primary growth at the apex of a shoot is the ____
a. terminal bud b. internode c. axil d. lateral bud e. node
Which of the following is a key concern related to exponential population growth?
a. Degradation of the natural environment b. Shift of age structures in developing nations c. Limitations in funding family planning programs d. Implementation of international one-child policies
Type II survivorship curves
a. are characteristic of humans and elephants. b. indicate a fairly constant rate of death at all ages. c. indicate a high mortality rate in the very young. d. are characteristic of species in which most individuals live a relatively long life and die of old age. e. are typical of species with high biotic potentials.
Although it contributes no cells to the embryo, this structure guides the formation of the primitive streak:
A) endoderm B) mesoderm C) ectoderm D) neural crest E) hypoblast