The first land plants appeared around 470 million years ago, during the Ordovician period, when life was diversifying rapidly. They were non-vascular plants, like mosses and liverworts, that didn't have deep roots
Answer:
El ciclo cardíaco consta de dos períodos i. mi. diástole y sístole.
Explicación:
El ciclo cardíaco consta de dos períodos i. mi. La diástole es aquella durante la cual el músculo cardíaco se relaja y se llena de sangre, mientras que la sístole es un período de contracción y bombeo de sangre. La diástole ventricular es el momento en el que las dos cámaras inferiores del corazón conocidas como ventrículos se relajan para permitir que la sangre fluya hacia adentro. La diástole auricular es el momento en que las dos cámaras superiores del corazón llamadas aurículas se relajan y permiten que la sangre fluya en.
The answer for this is ricket.
Ricket happens because there is a lack of calcium absorption, and vitamin d has effects on this because vitamin d helps the absorption of calcium. Calcium is a kind of mineral necessary for human body as it can strengthen bones and teeth. Lack of these can lead to soft bones, and especially in children, they may get ricket. Ricket is where the legs bend outwards.
Aside from rickets, there may be other possible deficiency symptoms and diseases such as weak muscles and pain.
Nucleus!! is where the dna is at. Which controls the cells activities through out our body
