Answer:
a) Soil type
b) Water quantity and quality
c) Intensity of light
d) Quantity and quality of fertilizer applied.
e) Environmental condition
Explanation:
Fertilizer plays an essential role is providing the essential nutrients to plants thereby boosting their growth.
Hence, in order to conduct a controlled experiment which shall monitor the impact of fertilizer on the growth of plants, all other factors which affect the growth of plants must be standardized or kept constant. These factors include -
a) Soil type
b) Water quantity and quality
c) Intensity of light
d) Quantity and quality of fertilizer applied.
e) Environmental condition
Water molecules forming hydrogen bonds with one another. The partial negative charge on the O of one molecule can form a hydrogen bond with the partial positive charge on the hydrogens of other molecules. Water molecules are also attracted to other polar molecules and to ions.
Answer: the fossil record, biogeography, comparative anatomy, comparative embryology, and molecular biology, Direct observation.
Explanation:
The answer is B
Commensalism is when one organism benefits, but the other organism is neither harmed or helped.
Answer: option C) enables the "let-down" reflex to occur when a woman breastfeeds her baby.
Explanation:
Oxytocin is a hormone secreted by the posterior pituitary gland. It stimulates the contractions of smooth muscles such as
- uterus facilitating childbirth
- ducts of the mammary glands resulting in ejection of milk. Thus, it is also called as milk-let-down-ejection factor.
So, option C is the correct answer
