Which of the following is a main difference when comparing an animal cell and a plant cell? Plant cells lack cell walls and form fixed shapes.

Animal cells have chloroplasts and mitochondria.

Animal cells lack cell walls and are irregular in shape.

Plant cells have one vacuole, produce chloroplast, but do not have mitochondria.

I think the answer is animal cells lack cell walls and irregular in shape animals do not have chloroplast because they do not manufacture their own food so chloroplast is only found in plants plants have cell walls

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.

b. climate change will cause an increase in biodiversity of all ecosystems.

hope this