Answer:
<em>a.Food webs are a group of connected food chains.</em>
<em>b.Arrows in a food web go from the organism that is being eaten to the organism that is eating it.</em>
<em>d.Arrows in a food web represent the flow of energy in a food web.</em>
<em>e.Food webs show all of the eating patterns in an ecosystem.</em>
Explanation:
A food web can be described as a combination of all the food chains of an ecosystem. It can be described as a graphical representation which depicts what eats what in an ecosystem. The graphical representation is shown by an arrow which shows which organism is being eaten by which organism. These arrow tend to show the flow of energy from one population to another. Hence, the statements a,b,d and e are true.
Statement c is false because food webs show the different types of organisms that a species eats.
Answer:
The correct answer would be the virus envelope.
Viral envelope is a protective covering present around the capsid proteins in some viruses.
It is usually derived from the cell membrane of the host and thus it is composed of lipid and viral proteins.
It provides stability to the viral particle, helps in protecting the viral genome, and aids in the fusion of the virus with the membrane of the host.
Examples of viruses in which envelope is present: herpesviruses, poxviruses, flavivirus, hepatitis D et cetera.
Examples of viruses in which envelope is absent: adenoviridae
, papillomaviridae
, picornaviridae
, caliciviridae et cetera.
Answer:
The correct answer is: A. Only the best-adapted animals in a population survive.
Explanation:
- Natural Selection is the process by which the individuals of a species which has the potential to sustain and survive in adverse or changing environment gets a survival advantage over those individuals which are unable to adapt themselves to altered environmental conditions.
- As the less potent individuals die in altered environmental conditions the adaptable individuals escapes competition with them for natural resources.
- Evolution causes species to alter their characteristics depending upon the demand of the conditions. These changes can vary, can be less or drastic.
- Animals pass all the newly adapted traits to the successive generations either as genetic traits or as acquired traits, as this is necessary for the offspring to survive in the altered environment.
- Natural selection is best defined as "the survival of the fittest".
The correct order of phases in the menstrual cycle is;
menses, .estrogenic phase, ovulation, and progestational phase.
The menstrual cycle is complex and is controlled by many different glands and hormones that these glands produce.
There are four phases of menstrual cycle; namely, menstruation, the follicular phase, ovulation and the luteal phase.
