Question

animals have a variety of adaptations, including trachea and gills, which allow this key process to occur. which provides the molecules necessary for cellular respiration and efficient atp synthesis?
a) digestion
b) nutrient absorption
c) waste elimination
d) gas exchange

question 12 (5 points)
listen
liverworts and mosses were some of the earliest land-based plants. which statement correctly explains why these species are still restricted to growing in moist environments?
a) they dont have cell walls to retain moisture in their cells and dry out otherwise.
b) their seeds must absorb water in order to germinate.

Explanation:

First Question (about animal adaptations and cellular respiration)

Cellular respiration requires oxygen ($O_2$) and produces carbon dioxide ($CO_2$). Gas exchange (via trachea, gills, etc.) supplies $O_2$ (needed for ATP synthesis in respiration) and removes $CO_2$. Digestion breaks down food, nutrient absorption takes in nutrients (not directly for respiration’s gas needs), and waste elimination removes waste, not provide respiration molecules.

Second Question (about liverworts and mosses in moist environments)

(Note: The options provided seem incomplete, but based on the given options and plant biology: Liverworts and mosses are non - vascular plants and have a lack of true roots, stems, leaves with vascular tissue. Also, they rely on water for fertilization (sperm needs water to swim to egg). But among the given options:

• Option A is incorrect as plants (including liverworts and mosses) have cell walls.
• Option B is incorrect as liverworts and mosses are non - seed plants (they reproduce via spores, not seeds).

If we assume there are more options (like ones related to water - dependent fertilization or lack of vascular tissue for water transport), but with the given options, neither A nor B is correct. However, if we must choose from the given:

• Option A: Liverworts and mosses (plants) have cell walls, so this is wrong.
• Option B: Liverworts and mosses are non - seed plants (reproduce by spores), so they don't have seeds that need to absorb water for germination.

Answer:

D) Gas exchange