What is a characteristic of most animals?
A. They are autotrophic.
B. They lack an extracellular matrix of proteins such as collagen.
C. They have Hox genes.
D. They have cell walls.
Answer: C
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What does a gametophyte produce?
A. Diploid gametes B. Haploid spores C. Diploid spores D. Haploid gametes
In the study involving periwinkle snails and their algal food sources, which conclusion can be drawn?
a. Periwinkles eliminated all algae and died out. b. Periwinkles eliminated all of the less dominant algae species. c. Periwinkles eliminated the dominant algae entirely. d. Periwinkles had no effect on the algae populations. e. Periwinkles can increase or decrease species richness depending on which algal species it is consuming.
For sperm to be able to penetrate the zona pellucida of the egg, enzymes are released from the ________
Fill in the blank(s) with correct word
The first classification systems were based mainly on structural features. However, modern classification systems take other criteria into account. Which criterion serves as the basis for the modern classification system?
A) habitat B) morphology C) body plan D) evolutionary relationships