Scientists hypothesize that there are no dinosaurs alive today becauseA.an ice age froze all the dinosaurs
B.They were all killed when a large meteor hit earth
C.They could not adapt to a new environment to avoid extinction
D. mammals out-competed the dinosaurs for food and living space.

Answers

Answer 1
Answer: The answer is C-they could not adapt to their new environment to avoid extinction

Related Questions

A student did an experiment with two identical plants, Plant 1 and Plant 2. About 10 mL fertilizer was added to Plant 1. About 200 mL of water was added to each plant every day. The height of the plants was recorded over a period of 5 weeks in the table shown below.Week Height of Plant 1 (in inches) Height of Plant 2 (in inches) 1 12.6 12.6 2 13.8 12.9 3 14.9 13.4 4 15.7 13.8 5 16.6 14.6 Based on the table, which of these conclusions is correct? Fertilizer helps plants grow taller. Fertilizer can help a plant survive for five days. Plants need more than 10 mL fertilizer to grow in size. I choose A is it right?
Which statement is true of a placenta?a. The placenta passes oxygen, nutrients, and other useful substances from the fetus to the mother. b. The placenta passes oxygen, nutrients, and other useful substances from the mother to the fetus. c. The placenta mixes blood from the mother and fetus together. d. The placenta protects the mother from being attacked by the fetal immune system.
Are a group of cells that work together to perform a specific function.A)organs B) tissues C)organ systems D)organisms
The sensory division of the bodya. is part of the central nervous system. b. includes sensory neurons that receive impulses from the central nervous system. c. contains the somatic and autonomic nervous systems. d. transmits impulses to the central nervous system from sense organs.
The chemical that promotes phototropism is _____.-auxin -gibberellin -cytokinin -abscisic acid (ABA)

What is the most important role of lipids?

Answers

Explanation:

The most important role of lipids is the fats, phospholipids, waxes, and steroids. Lipid is a compound that contains carbon and hydrogen and is used to store energy, provide structure, and transmit information. Fats are stored in adipose tissue. Adipose tissue a group of cells that store fat, generally found under the skin and around organs.

Phospholipids are the main component of cell membranes. Waxes provide a waterproof coating on leaves and feathers. Steroids are part of cell membranes and chemical messengers in the body. It has long-term energy storage, provides insulation and protection.

they are used mostly as a barrier

A father with type B blood and mother with type A blood have a child. Their child, while in a biology lab at school, tests her blood and discovers she has type O blood. Does she have any concerns about her parentage?A. Yes, because she should have type AB blood if they are her true biological parents.
B. No, because type O blood is possible if her parents both had genotypes AB.
C. No, because both of her parents could be heterozygous.
D. Yes, because both of her parents might be heterozygous.
E. No, because blood types A and B are codominant.

Answers

C. you can have an A or B blood type but also have recessive genes that could give an O if parent were heterozygous, like if the mother was A-i (i being recessive gene that could give 'O') and the father was B-i then if you do a punnett square then you can see that there's a 25% chance she has i-i or type O blood. 
C. if the father was B, the mother was A, and the child had O, then the father had to be Bi and the mother had to be Ai

Which group of animals has existed the longest? A. Tubulidentates
B. Perissodactyls
C. Artiodactyls
D. Sirenians

Answers

the answer is B) Perissodactyls

Explain the difference between potential and kinetic energy

Answers

Potential energy is still energy. Energy that is siting and not in motion.
Ex. car, something on a dresser or bookcase

Kinetic energy is the complete opposite. It is energy that is in motion, also active energy.

Please vote my answer brainliest! Thanks.

Answer: Potential energy is still. Kinetic energy is energy in motion.

How is HIV contracted, and what are the treatment options?HIV is spread during unprotected sex with an infected individual, and it can only be treated if detected within the first few months of being infected.
HIV is spread during unprotected sex or through contact with infected blood; it cannot be cured, but early treatment can minimize the long-term consequences.
HIV is transmitted through contact with infected bodily fluids; there is no cure or safe treatment to reduce the symptoms and consequences of the disease.
HIV is transmitted by sharing drug needles or food with an infected individual; it cannot be cured, but there are experimental medications to minimize the risk of AIDS.

Answers

I believe the correct answer is: HIV is spread during unprotected sex or through contact with infected blood; it cannot be cured, but early treatment can minimize the long-term consequences.

Explanation:

Human Immunodeficiency Virus is a type of virus which causes an impairment of the immune system of the person making them susceptible to diseases such as tuberculosis, influenza and any other disease that can exploit this opportunity. It is spread by a person coming into direct contact with infected bodily fluids such as saliva during deep kissing, semen during intercourse, blood after an accident or even fluids when sharing needles and syringes for drug addicts. There is no cure but the current form of treatment slows down the virus to prevent some consequences.

Further Explanation:

The virus is enters the body through open wounds or surfaces such as the vagina or mouth where the skin is very thin and can tear. After penetrating the skin, it attaches to specific immune cells called CD8+ T-cells on points called receptors. It then enters the cell and replicates itself in the nucleus of the cell and as it goes out, it kills these immune cells making the person to have a weak immune system. The current drugs used called AntiRetroVirals (ARVs) such as the drug Zidovudin stops the virus from replicating thus reducing the total amount of virus in the body called the Viral Load. Some drugs target enzymes called proteases and reverse transcriptase that help the virus to replicate. This viral load is what is counted to estimate the total volume of HIV someone has in their body. Infected persons should use protection while having sex and also avoid sharing sharp objects to prevent transmission. They also need to take their medication to make them much more healthier in addition to taking proper balanced diets.

Level: High School

Subject: Biology

Topic: The Immune System

The HIV is spread in unprotected sex or through contact with an infected blood. Although it cannot be cured but still the early treatment can reduce the long term consequences.

Further Explanation:

HIV or the Human Immunodeficiency Virus reduces the person's immune system by destroying or damaging the cells which fights with disease and infection. Proper cure for HIV is not there but effective medical care can control it.

There can be different stages of HIV:

1. Stage 1: Acute HIV infection: In acute HIV infection there is high number of virus in the blood and they are very contagious.

2. Stage 2: Clinical latency: It is chronic HIV infection. At this stage, HIV is active however reproduces at a low levels.

3. Stage 3: Acquired immunodeficiency syndrome: It is very critical stage of HIV infection. Symptoms of AIDS include chills, swollen lymph glands, sweats and weight loss.

Transmission of HIV:

1. Through sexual behavior or by the use needle or syringe. Example certain fluids like blood, rectal fluids, breast milk and pre-seminal fluid.

2. From the mother to child during breast feeding, pregnancy or birth.

3. Receiving blood through the transfusions or the organ transplants

4. Contact through the wounds, skin or broken skin and an infected blood.

HIV can also be converted into HIV superinfection, it occurs when a person with HIV gets infected with another strain of virus. The new strain may live along with the original strain or may replace the old strain. The superinfection can cause people to become sicker faster.

Learn more:

1. Learn more about blood brainly.com/question/1213217

2. Learn more about disease brainly.com/question/1062663

3. Learn more about injury brainly.com/question/768278

Answer Details:

Grade: Middle school

Subject: Biology

Chapter: Human disease

Keywords:

HIV, Human Immunodeficiency Virus , immune system, disease, infection, acute HIV infection, Acquired immunodeficiency, AIDS, lymph glands, sexual behavior , pregnancy, birth, organ, transplants, HIV superinfection.

The embryonic stem in a seed is called thea. radicle.
b. hypocotyl.
c. seed coat.
d. endosperm.

Answers

the embryonic stem in a seed is the plumule.

it grows out of the hypocotyl, which that itself grows out of the radical, which is attached to the microphyl, feeds on the cotyledon, is fertilized by the endosperm, and is all protected by a hard seed coat :)