Understanding the resistance to drought in desert plants.

Of the following mechanisms in desert plants which would be the LEAST effective in resisting drought: Dying back of root hairs during a dry season Expansion of total leaf surface area Ability to store large amounts of water Shedding leaves during the dry season Thick walled seeds

question on building a ecosystem in a jar with water algae & small aquatic animals

if a 1st grade class were to build a simple ecosystem in a jar, and add water, algae, and small aquatic animals that eat algae- then they weigh their algae and the animals at the end of the year. If they were to compare the total weight of all the algae and the combined weight of all the animals, which will weigh more?? EXPLAIN this using terms of energy and nutrients.what observations and inferences would be used to answer this?

Efficiency

I'm having trouble understanding the Assimilation and Production Efficiencies for Endotherms and Ectotherms. How do you determine which has the most efficiency?

What are the assimilation and production efficiency of ectotherms versus endotherms and which are the most efficacious?

What are the assimilation and production efficiency of ectotherms versus endotherms and which are the most efficacious?

Distribution and abundance of plants in a habitat

I have been asked to: Plan an investigation to find out the distribution and abundance of two named species of plant in a specific habitat and to determine if this is effected by the water content of the soil. I dont really know what the question is asking me to do or even where to begin. Please could you try to explain what it is asking me to do - I can do the research myself, I just need to know what exactly is being requested. Thank you so much!