b. manipulated by changes to the independent variable.
c. a variable that is kept constant.
d. a variable that is used as a control
a dependent variable depends on the independent variable
the answer is C on E2020
Answer:
The term that is used to describe all the species, which lives in the Arctic National Wildlife Refuge is community.
Explanation:
The community also considered as the biological community signifies towards an associating group of distinct species in a specific location. For example, the plants grown underneath and a forest of trees, inhabited by animals, and the roots in soil constituting bacteria and fungi, leads to the formation of a biological community.
Answer:
b
Explanation:
fertilization
conjugation
pollination
The answer is fertilization.
Fertilization is the process in which two gametes fuse to creates one cell. In this process male sperm fuses with female egg which creates a zygote.
Asexual reproduction involves the formation of offsprings without gamete fusion. Conjugation is a process of exchange genetic material between bacteria. Pollination is a process of transfer pollen to the female reproductive structures in plants, which enables fertilization.
Answer:
The answer is fertilization.
Explanation:
b. False
Answer: False.
Meat is a good source of protein. There are nine essential amino acids which are required under special conditions like illness.
These are- Histidine, Leucine, Isoleucine, Valine, Threonine, Methionine, Lysine, Phenylalanine and Tryptophan. They cannot be synthesized by the body and therefore need to be taken from external protein sources.
Since meat contains all the essential amino acids, therefore it is considered as a good source of protein. Hence, the given statement is false.
Answer:
False
Explanation:
The right answer is A. Hardness.
The hardness of a material defines the resistance of a surface of the sample to the penetration of a punch, for example a hardened steel ball (Brinell hardness) or a diamond pyramid (Vickers hardness). If it resists well, it is said hard, otherwise it is soft. The hardness is measured on different scales depending on the type of material considered.
Unlike minerals whose hardness is characterized by scratching (Mohs scale), bounce or penetration tests are usually used to characterize the hardness of metals, plastics and elastomers. These tests have the advantage of being simpler to perform and give reproducible results. There is a wide variety of possible hardness tests, they are widely used in quality control to compare or estimate the strength or stiffness of materials.