Endocrine signaling is hormone based signaling that travels through the blood stream. Many of the sensors and integrating sensors of the endocrine system are located in the brain. The brain barrier contributes to endocrine signalling, such that the brain barrier does not factor in with endocrine signalling. The answer is A
These <span>large leaves of ferns that show multiple venation are called fronds.</span>
The variations might help the organism to survive if there is a change in its environment
Eg heat resistant bacteria
The variation might help the organism survive predators
Eg. Green beetles blend with green leaves thus disabling crows to spot them
:)
Answer:
they do not evolve, they are birds
Explanation:
Well it happens every six months, one in summer in June and winter December. And if i'm wrong then i understand :) <span />