It takes approximately _____ action· potentials from olfactory receptors for us to perceive· an odor· .

1 answer:

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Action potentials (i.e. nerve impulses) occur in several types of animal cells, called excitable cells, which include neurons, muscle cells, endocrine cells, and in some plant cells. It takes around 40 action potentials for a smell sensation to be reported.

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What are some facts about fertilization?

Shkiper50 [21]

Answer:

Internal Fertilization: Mammals,birds and reptiles in them the mode of fertilization is internal

External Fertilization: Amphibians and fishes used external fertilization.

Egg laying Animals;Birds,reptiles and some mammals platypus lays eggs.

Explanation:

Fertilization is a process in which a female egg (Ovum) and male egg (sperm) unite to form a zygote.A zygote is a fertilized egg which grows within an embryo.The process of fertilization is important in eukaryotes such as animals, humans,birds and plants. Fertilization divides a cell into many daughter cells by the process of mitosis and meiosis.It doubles the chromosome numbers.Fertilization are of two types internal and external.