Ha ha ha, those are rules!
Explanation it can also slow down photosynthesis. ... These mechanisms can shut photosynthesis down if sugaraccumulation is too high.
Exercise 1:
an ocean
a pebble
an insect
a bug
a web
an archaeologist
an eagle
a geologist
a fossil
an ancient fossil
You only change "a" to "an" when the next word starts with a vowel.
1. Earth
2. Mercury
3. Venus
4. Jupiter
5. Saturn
6. Uranus
7. Mars
8. Neptune
