What is the ultimate source of genetic variation within a population?
a. Mutations in DNA
b. Adaptation of a species to environmental changes
c. A sensory system that can detect an environmental change
d. Homeostatic mechanisms that compensate for environmental changes
e. A system of locomotion that allows an organism to escape environmental changes
a
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True or false? Both spores and sperm of a seedless vascular plant are haploid
Indicate whether the statement is true or false
Secondary consumers are
A. All of the answer choices are correct. B. herbivores. C. fungi. D. bacteria. E. carnivores.
What organism is at the first trophic level in a tallgrass prairie ecosystem?
a. birds b. grasshoppers c. grasses d. decomposers e. parasites
The spinal cord runs through the vertebral column
and connects with the brain through the __________. Fill in the blank(s) with the appropriate word(s).