Answer: The best definition I can think of for an ecosystem is that an ecosystem is a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system. These biotic and abiotic components are linked together through nutrient cycles and energy flows.
Explanation:
1. Early earth had no ozone layer, which means it was most likely extremely hot.
2. Young earth had no oxygen and life needs oxygen in order to survive.
3. There where so many natural disasters happening all the time, like volcanic eruptions and constant impact with meteorites and asteroids.
-Extra one (4. Earth originally had no ocean and water. Oceans eventually formed from the water vapor released from the volcanic eruptions, but before that there was nothing.)
Answer:
Diploid
Explanation:
Sexually reproducing organisms are diploid (having two sets of chromosomes, one from each parent). In humans, only their egg and sperm cells are haploid.
Cellular respiration is the process by which organisms use oxygen to break down food molecules to get *chemical energy *for cell functions.
(If you didn't know already )homosexuality is a very touchy subject to talk about for some people.
( )=these just mean that you could use it in the sentence
there you go...i hope its good