Which trait of a vascular plant allows it to grow in the direction necessary for survival?
a. apical meristem
b. gametangium
c. stomata
d. sporangia
a. apical meristem
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Most golden algae are
a. unicellular and autotrophic. b. unicellular and heterotrophic. c. colonial and autotrophic. d. colonial and heterotrophic. e. multicellular and heterotrophic.
In addition to the deposit feeding brittle stars pictured, what other type of organism is abundant in this photograph?
1.sea cucumbers
2.urchins
3.bivalves
4.sea stars
What would happen if human chorionic gonadotropin levels did not rise adequately during pregnancy? What will be an ideal response?
Why is the amniotic egg considered a key evolutionary innovation?
a. It enables eggs to float in an aquatic medium. b. It greatly increases the survival probabilities of eggs in a terrestrial environment. c. It extends embryonic development. d. It prohibits external fertilization, thereby facilitating the evolutionary innovation of internal fertilization. e. It has a shell with a single membrane.