The cell membrane is semi permeable in nature, that is, it allows the passage of some substances while it disallows some substances. Small and non polar molecules pass quite easily through the cell membrane but large and polar molecules can not do this.
The substances which can easily pass through the cell membranes make use of passive transports such as diffusion and facilitated diffusion to enter the cells while substances which can not pass through the cell membranes on their own make use of active transport. Examples of active transport are endocytosis and ectocytosis,
The heart is beneath the breastbone in the chest cavity of the frog
Answer:
Greenhouse gases have far-reaching environmental and health consequences.
First quetion is the 2 one the second quetion is hybrid and the third quetion is forms