Answer:
a. enclosing their DNA in a nucleus.
Explanation:
Prokaryotes in general have no membrane bound organelles. The cells are enclosed in a plasma membrane though .
The name of chemicals that are secreted by glands into the blood and those that affect organs elsewhere in the body are known as Hormones.
<h3>What is Gland?</h3>
A Gland may be defined as an organ in the human or animal body that perspires certain chemical substances for usefulness in the body or for liberation into the surroundings.
The endocrine glands are responsible for the synthesis of such chemical substances into specific body parts and organs and pass them directly into the bloodstream. These chemical messengers are thought to be the agents of communication between one body part and another.
Therefore, it is well described above.
To learn more about Endocrine glands, refer to the link:
brainly.com/question/1128099
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Answer:
A food web consists of many food chains. A food chain only follows just one path as animals find food. eg: A hawk eats a snake, which has eaten a frog, which has eaten a grasshopper, which has eaten grass. A food web shows the many different paths plants and animals are connected.
Answer:
species richness is the number of species in an ecosystem
