Answer: Possession of Valves
Explanation: Veins possess valves which ensures that blood flows in only one direction. Valves helps blood to flow back to the heart against gravitational force.
Arteries don't have valves because the pressure originating from the heart is capable of causing the blood to flow in one direction.
Answer:
D. Mutually beneficial: the bee receives pollen and the flower gets help with its reproduction
Explanation:
It is a mutually beneficial relationship because the flower provides the bee with nectar and pollen. Also, the bee provides the flower with a means to reproduce by spreading pollen from flower to flower through pollination.
When someone's pancreas stops producing the hormone that lowers blood sugar because the person hasn't eaten recently
When someone's pancreas hormone increases every time they eat, but decreases when they aren't eating
When a person takes calcium supplements so a gland will stop secreting a hormone that pulls calcium from the bones
Answer:
Describe a typical prokaryotic cell. a. It has a cell wall enclosing cell membrane, cytoplasm, ribosomes and nucleoid region with genetic material. It may have a protective capsule, flagellum, pili and plasmids. b. It has a cell wall enclosing cell membrane, cytoplasm, ribosomes and nucleus containing genetic material. It may have a protective capsule, flagellum, pili and plasmids. c. It has a cell wall enclosing nuclear membrane, cytoplasm, ribosomes and nucleoid region with genetic material. It may have a protective capsule, flagellum, pili and plasmids. d. It has a cell wall enclosing nuclear membrane, cytoplasm, mitochondria, vacuoles and nucleoid region with genetic material. It may have a protective capsule, flagellum, pili and plasmids.
Explanation:
