Two species of buttercup are found in the same field in South Dakota, but they emerge at different times: One species emerges and flowers in early spring, and the other species does not emerge until late summer, after the first species has set seed
This is an example of
A) resource partitioning.
B) habitat fragmentation.
C) intraspecific competition.
D) niche realignment.
E) niche fragmentation.
A
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In humans and other mammals, X inactivation takes place:
A. early in development, with each new cell inheriting the same inactivated X chromosome as its parent cell. B. late in development, with each new cell inheriting the same inactivated X chromosome as its parent cell. C. throughout the lifetime of an organismâ€"with each new cell division, both X chromosomes are activated, and one is then inactivated in each new cell. D. early in development, with all maternal X chromosomes being inactivated and cells maintaining active copies of only the paternal X chromosome. E. early in development, with all paternal X chromosomes being inactivated and cells maintaining active copies of only the maternal X chromosome.
During which step of urine formation will water, glucose and amino acids be returned to the blood? a. Urination b. None of these choices
c. Tubular reabsorption d. Glomerular filtration e. Tubular secretion
The four organic molecules found in all living systems are carbohydrates, nucleic acids, lipids, and ________
Fill in the blank(s) with correct word
Which structure is found in both plant and animal cells?
A) chloroplasts B) mitochondria C) a large central vacuole containing fluid D) cell wall surrounding the plasma membrane