The fifth week of pregnancy.
Answer:
Vascular plants are successful land plants. Spermatophyte (seed plants) is the largest group of vascular plants having two sub classes, angiosperms and gymnosperms. It include 300 families, 12500 genera and 300000 known species. The most successful and and important of these plants belong to Gramineae or the grass family with 7500 known species, which have colonized the great area of earth surface in particularly all sort of soil and climatic conditions and constitute the main source of man's food supply.
Factors responsible for success
1. Their adaptability to all kinds of environments.
2. The production of flowers, fruits and seeds, which show various adaptations for dispersal over large area.
3. These plants posses cuticle a thick cover around the epidermis which help in maintaining water or prevent dehydration.
4. Stomata are pesent in leaves or lenticle in stem which regulate the in and out of CO₂, O₂ and H₂O.
5. Well develop root system which help in absorption of mineral and other nutrients.
Answer:
D. 95% of the energy expended to mine and produce items from virgin ore is saved by recycling.
Explanation:
It takes just 5% of the energy used in producing new aluminium from the raw ore to recycle scrap aluminium
Yes the mitochondria is essential for both plant cells and animals cuz it’s the powerhouse of the cell
Answer: b) is waves of muscular contractions that move along the length of the digestive tract.
Explanation:
a) is not right, since the movement is triggered by a signal sent to the brain, which coordinates the movements.
c) is not right, since the esophagus smooth muscle is arranged in circular and longitudinal muscle layers.
NOTE: the peristalsis do not only ocurrs in the esophagus. It also occurs in all the digestive tract, as well as in the bile conducts and also in the urinary system, to conduct the urine from the kidneys to the bladder.