They allowed scientists to study heredity and further develop it
Answer:
Habitat loss
Explanation:
Habitat loss is the single greatest threat to biodiversity on Earth today and in fact it is the second largest threat to our existence on this planet next to Climate Change.
I say A they dont neither grow or lower. and if they do they go back to normal
The two membranes pull apart a little and create a small pocket or sack of air. As the developing bird grows, it breathes in oxygen from the air sack and exhales carbon dioxide. Several thousand microscopic pores all over the surface of the egg allow the CO2 to escape and fresh air to get in.
Please mark brainliest :)
Answer:
ok I'm <em>pretty </em>sure that for #1 it's either a or d, its deffinetly not b or c
and for #2 its b, but i'm not entirely sure, its been a while since I've done biology
Explanation: