The correct answer would be A
<span>A) they prevent blood from flowing backwards
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The appropriate answer is c. a tertiary consumers. Tertiary consumers are usually carnivores that eat other carnivores. The grass in the food chain is the primary producer. Primary producers are plants who get their energy from the sun. The grasshoppers are primary consumers or herbivores. The frogs are secondary consumers and they are also carnivores. A food chain shows how energy is passed on in an ecosystem.
Answer:
The stem cells are the special cells that can develop into different types of specialized cells. There are two major stem cells in the body. The one is an embryonic stem cell that presents in the initial divided few cells that have the ability to develop into any type of specialized cells.
The other one is adult stem cells such as Bone marrow that contains two types of stem cells: hemopoietic which has the ability to produce all three types of cells, and stromal that able to produce special muscles and bones due to their limited ability to develop specialized cells or multipotent.
Thus, embryonic stem cells are more useful than adult stem cells.
Answer:
Non-vascular plants are plants without a vascular system consisting of xylem and phloem. ... Bryophytes, an informal group that taxonomists now treat as three separate land-plant divisions, namely: Bryophyta (mosses), Marchantiophyta (liverworts), and Anthocerotophyta (hornworts)
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