You are presented with the question "What is the initial cause of black holes?" and the following answer choices: - energy - gravity - heat - photons - mechanical - sun's heat - cracking - Smoking Now knowing that ablack hole is formed by a high-mass star collapses and then, gravity collapses the star, choose the best answer.
gravity
(Question)
You are presented with the question "Changing the structure of a chromosome can be what to an organsim?" and the following answer choices: - massive damage - mechanical - beneficial - harm them - negative - dangerous - homogenous - Damages them Now knowing that mutations may change the structure of a chromosome or just change a single nucleotide and most mutations are beneficial to the organism, choose the best answer.
(Answer)
beneficial
Ques: You are presented with the question "What is an example of an animal that lacks a respiratory and excretory system?" and the following answer choices: - Dog - Human - alpacas - cacti - Starfish - Leeuwenhoek - Elephants - cows Now knowing that echinoderms lack respiratory and excretory systems and starfish and sea urchins are also echinoderms, choose the best answer.
Ans: Starfish
(Q).
You are presented with the question "What helps plants survive?" and the following answer choices: - nutrients - staying warm - Loose pants - hydration - hydrate their cells - Looseness of soil - Looseness of belt - Looseness of lips Now knowing that the looseness of soil increases the amount of oxygen in that soil and without oxygen in the soil, most plants die, choose the best answer.
(A).
Looseness of soil
Ques:You are presented with the question "what's survival is influenced by population size?" and the following answer choices: - chickens - fur seals - density - gravity - humans - ducks - animals - clouds Now knowing that population size influences the chances of a species surviving and all humans are the same species, choose the best answer.

Ans:humans
Ques: You are presented with the question "What does an automobile create when it burns fuel?" and the following answer choices: - Acids - tar - Energy. - heat - Gases - gas - sweat - energy Now knowing that operating an automobile usually requires fossil fuels and automobiles and the burning of fossil fuels generate gases such as sulphur dioxide, choose the best answer.
Ans:
Gases