A flowering plant with 12 chromosomes in its somatic cells , how many chromosomes are present in the ovule’s 2 integuments and or the Nucellus tissue 4
6
12
24

How do chloroplasts set plants apart from other living things

The picture represents a structure of the respiratory system. which is the function of this structure? to bring air into the body to exchange oxygen with carbon dioxide to carry air to the lungs to release oxygen from the body

On a spring day, a middle-latitude city (about 40? north latitude) has a surface (sea-level) temperature of 10 ? c. if vertical soundings reveal a nearly constant environmental lapse rate of 6.5 ? c per kilometer and a temperature at the tropopause of –55 ? c, what is the height of the tropopause?