Answer:
a competition to survive and reproduce; the struggle for existence
Explanation:
Answer:
A woman is born with all of her eggs, which are stored in her ovaries. The ovaries also make the hormones estrogen and progesterone, which control her period (menstruation) and the release of eggs (ovulation). Menopause happens when the ovaries no longer release an egg every month and menstruation stops.
Answer:
The dura mater and pleural contain fluid which lubricates the brain and lungs respectively.
Explanation:
Dura mater is the outermost layer and a sac in the brain that envelope arachinoid and it's surrond venous channels which carried blood from the brain to the heart. The dura mater contain cerebrospinal fluid and drains it from the brain to the internal jugular vein
The pleural help in the proper functioning of the lungs and it supply pleural fluid which lubricates the lungs and allow for respiration.
In order for plants to assimilate nitrogen directly into their system, the nitrogen must be in the form of nitrates. Nitrogen in the air and ammonia from decayed matter in the soil is converted to ammonium by decomposers and nitrogen-fixing bacteria. The ammonium is further nitrified to nitrates by nitrifying bacteria. Finally, the nitrates can then absorbed by the plants.
The accurate answer is:
Natural selection is based on Darwin’s observation that individuals most likely to survive and reproduce are those _____.Environment
