Stromatolites are
A. layered rocklike structures formed by cyanobacteria.
B. the earliest known arthropods.
C. autotrophs living around deep sea vents.
D. heterotrophs found in marine environments.
E. fossilized coral reefs.
A. layered rocklike structures formed by cyanobacteria.
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How does the embryo of an oviparous animal obtain nutrients to grow?
A. from the mother's body B. from the yolk C. through tiny pores in the shell of the egg D. from the nucleus within the yolk E. from the egg cytoplasm
Which of the following is a benefit of chemical diversity to humans?
a. Increased soil productivity b. Potential pharmaceutical and medical discoveries c. Larger number of distinct species d. Genetic diversity in crops used in commercial agriculture
All gills
a. consist of overlapping rows of filaments. b. are external. c. are paired. d. are associated with a blood transport system. e. fit all of these descriptions.
Select all of the following statements that describe the structure of a molecule of DNA.A) twisted double helixB) single-strandedC) contains the nitrogenous bases, adenine, thymine, cytosine, and guanineD) contains deoxyribose sugarE) contains the nitrogenous bases adenine, uracil, cytosine, and guanine
What will be an ideal response?