Answer:
most algae are autotrophs or more specifically, photoautotrophs
Explanation:
The highest trophic level in a pyramid typically has the least energy available to it because there's fewer things to gain energy from and energy will have been lost through the chain by dissipation etc
Answer:
space
Explanation:
they figured it out going to space and since a star is a small peice of the sun they can't touch it it's impossible without getting heat burns or dying so they ither observe a star using a telescope or went to space for days
1) Sunlight, Water, Carbon dioxide
2) Starch, Oxygen
3) 'cause one's need can be fulfill only by other one.