A researcher has been studying columbine in a meadow over the last decade. During that time, she has noticed that columbine flowers have gone from producing long nectar spurs to very short nectar spurs
What can the researcher deduce from this observation? Select all
correct choices.
A. That the columbine in the meadow has
evolved to accommodate new pollinators.
B. That the columbine in the meadow has
access to more nutrients.
C. That there are more bees visiting the
meadow compared to moths.
D. That new species of columbine may have
emerged in the meadow.
A,C,D
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The evolutionary process in which the timing of development is altered so that a sexually mature organism retains the physical characteristics of the juvenile form is called ____
Fill in the blank with the appropriate word.
For a typical flowering plant, the first cell of the triploid (3n) endosperm is formed from ____
a. one sperm fused with two antipodal cells b. two sperm fused with the egg c. one sperm fused with the synergid d. one sperm fused with the endosperm mother cell e. two sperm fused with a synergid
The fibrous sac that encloses the heart is the ________.
A. myocardium B. epicardium C. ectocardium D. pericardium E. endocardium
Explain the origin, location, and function of the proton gradient in the process of photosynthesis. What will be an ideal response?