Answer: All the options are correct.
Explanation:
A pericardium is the sac that compass the heart , protects , lubricate and keep it in place.
The functions of pericardium are:
1. It keep the heart fixed in its place in the chest cavity.
2. It prevent the heart from stretching and overfilling with blood I.e it minimize blood infow.
3. It prevents friction by lubricating the heart.
4. It protects the heart from infection that might be nearby either from lungs or other organs.
Answer:
25%
Explanation:
According to this question, a seek stored seeds of a rare and endangered plant. In order to ensure that the seeds remain fresh, 120 seeds are selected to be grown. However, out of these 120 seeds, only 90 germinated. This means that only 90 of 120 seeds are fertile.
This further means that (120-90) = 30 seeds are infertile and hence, could not germinate. In percentage, this can be represented as:
30/120 × 100
= 1/4 × 100
= 100/4
= 25% of the selected seeds are infertile.
In much of a digestive tract such as the human gastrointestinal tract, smooth muscle tissue contracts in sequence to produce a peristaltic wave, which propels a ball of food (called a bolus while in the esophagus and upper gastrointestinal tract and chyme in the stomach) along the tract.
Answer:
Small populations tend to lose genetic diversity more quickly than large populations due to stochastic sampling
Explanation: